still not running right, what's the problem here - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cfan10 · 02-23-2015, 12:03 PM

90 burb 350 TBI changed fuel filter and now it has killed at the stop light twice, starts right back up but still a pita. Can't find my spark plug socket, so no tune up yet. It idles smooth then rough and vibrates so I've been having to keep my foot on gas and brake to keep it running, then it smooths out again. Does this sound like this may be a timing issue? Always starts and it only does this in drive while sitting. Any advice is greatly appreciated. Thanks in advance.

90 burb 350tbi probably 300,000 miles. Shifts perfect.

cfan10 · 02-23-2015, 12:06 PM

Checked alternator it was fine. Also, there is two batteries actually hooked up, which is odd. One needs to be charged as I was told by autozone.

Rustynutzc10 · 02-23-2015, 12:23 PM

Check you idle control valve on the passenger side of the throttle body! The tps will be in the center and the idle control valve will be just to the left of it! A crescent wrench will back it out easily.

cfan10 · 02-23-2015, 10:51 PM

What is the red flag when I take it out? I'm new to TBI will the truck run without it? Thanks!

Rustynutzc10 · 02-23-2015, 11:08 PM

What you need to do is try and recreate the problem! When you unplug it the truck usaully runs as you have described. You can keep it running the way you have described also! No it wont run right without it, so it has to have it to operate correctly. Usually when you can recreate the problem intentionally you have found the issue!

turbosix · 02-24-2015, 02:34 AM

I had the same problem once and it turned out to be the TB to intake gasket. Mine looked good but I guess it wasn't sealing anymore. My Deville was doing the same thing and it was the TB to intake hose that had a crack in it.

Unfortunately it could be a lot of things, it's just an educated guess and a process of elimination. The IAC is definitely a good place to look. Could be a vacuum leak. How old is the fuel pump?

cfan10 · 02-24-2015, 11:18 AM

Thanks guys! I just bought it on the 8th of this month. Think I will call seller to try and find any info. I will try you alls suggestions. Thanks again.

68post · 02-24-2015, 11:29 AM

I agree "it could be alot of things", my '90 quit running and showed to be the fuel pump -but was actually just the sock on the end of the pump. (that was at least 20 yrs ago )

With that high of mileage there will be alot to look over, find out what all has been replaced already by the previous owner.

02-23-2015, 12:03 PM	#1
cfan10 Registered User Join Date: May 2011 Location: Texas Posts: 984	still not running right, what's the problem here 90 burb 350 TBI changed fuel filter and now it has killed at the stop light twice, starts right back up but still a pita. Can't find my spark plug socket, so no tune up yet. It idles smooth then rough and vibrates so I've been having to keep my foot on gas and brake to keep it running, then it smooths out again. Does this sound like this may be a timing issue? Always starts and it only does this in drive while sitting. Any advice is greatly appreciated. Thanks in advance. 90 burb 350tbi probably 300,000 miles. Shifts perfect. __________________ Rest In Peace:Mikhail {Mickey Rooney} Alpha 2/5/13 Omega 7/22/14 10:28AM I love you tremendously and outragiously Superpuppi Thai Ridgeback...The most intelligent dog known to me. Don't mess with my truck, my momma or my money...not necessarily in that order. © Stand for something or fall for anything. [LIST][*]'98 Bourbon St. Brawl ©2010

02-23-2015, 12:06 PM	#2
cfan10 Registered User Join Date: May 2011 Location: Texas Posts: 984	Re: still not running right, what's the problem here Checked alternator it was fine. Also, there is two batteries actually hooked up, which is odd. One needs to be charged as I was told by autozone. __________________ Rest In Peace:Mikhail {Mickey Rooney} Alpha 2/5/13 Omega 7/22/14 10:28AM I love you tremendously and outragiously Superpuppi Thai Ridgeback...The most intelligent dog known to me. Don't mess with my truck, my momma or my money...not necessarily in that order. © Stand for something or fall for anything. [LIST][*]'98 Bourbon St. Brawl ©2010

02-23-2015, 12:23 PM	#3
Rustynutzc10 Registered User Join Date: Feb 2015 Location: Terrell, Tx. Posts: 9	Re: still not running right, what's the problem here Check you idle control valve on the passenger side of the throttle body! The tps will be in the center and the idle control valve will be just to the left of it! A crescent wrench will back it out easily.

02-23-2015, 10:51 PM	#4
cfan10 Registered User Join Date: May 2011 Location: Texas Posts: 984	Re: still not running right, what's the problem here What is the red flag when I take it out? I'm new to TBI will the truck run without it? Thanks! __________________ Rest In Peace:Mikhail {Mickey Rooney} Alpha 2/5/13 Omega 7/22/14 10:28AM I love you tremendously and outragiously Superpuppi Thai Ridgeback...The most intelligent dog known to me. Don't mess with my truck, my momma or my money...not necessarily in that order. © Stand for something or fall for anything. [LIST][*]'98 Bourbon St. Brawl ©2010

02-23-2015, 11:08 PM	#5
Rustynutzc10 Registered User Join Date: Feb 2015 Location: Terrell, Tx. Posts: 9	Re: still not running right, what's the problem here What you need to do is try and recreate the problem! When you unplug it the truck usaully runs as you have described. You can keep it running the way you have described also! No it wont run right without it, so it has to have it to operate correctly. Usually when you can recreate the problem intentionally you have found the issue!

02-24-2015, 02:34 AM	#6
turbosix Registered User Join Date: Nov 2009 Location: Lake Jackson,Texas Posts: 126	Re: still not running right, what's the problem here I had the same problem once and it turned out to be the TB to intake gasket. Mine looked good but I guess it wasn't sealing anymore. My Deville was doing the same thing and it was the TB to intake hose that had a crack in it. Unfortunately it could be a lot of things, it's just an educated guess and a process of elimination. The IAC is definitely a good place to look. Could be a vacuum leak. How old is the fuel pump? __________________ Tommy 1 Pt. 3:21 '72 C10 LWB 402

02-24-2015, 11:18 AM	#7
cfan10 Registered User Join Date: May 2011 Location: Texas Posts: 984	Re: still not running right, what's the problem here Thanks guys! I just bought it on the 8th of this month. Think I will call seller to try and find any info. I will try you alls suggestions. Thanks again. __________________ Rest In Peace:Mikhail {Mickey Rooney} Alpha 2/5/13 Omega 7/22/14 10:28AM I love you tremendously and outragiously Superpuppi Thai Ridgeback...The most intelligent dog known to me. Don't mess with my truck, my momma or my money...not necessarily in that order. © Stand for something or fall for anything. [LIST][*]'98 Bourbon St. Brawl ©2010

02-24-2015, 11:29 AM	#8
68post Registered User Join Date: Jan 2014 Location: Indpls. , IN Posts: 795	Re: still not running right, what's the problem here I agree "it could be alot of things", my '90 quit running and showed to be the fuel pump -but was actually just the sock on the end of the pump. (that was at least 20 yrs ago ) With that high of mileage there will be alot to look over, find out what all has been replaced already by the previous owner. __________________ Tim K. 84 K30 srw Silverado 454 auto 85 C20 350 C6P auto flatbed 94 K1500 lifted shortbed 350 4 bbl NV4500



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