Stumble on acceleration - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Hooker · 11-19-2007, 09:25 AM

Got a question for you guys... i am a little stupid when it comes to these things but i seem to be a quick learner....

my truck after warm up in the drive way seems to have a stumble on acceleration and after it has been driven for a while dies while at a light.... it is a 350 350 combo with a slight cam and a street avenger 670 carb.... i need a fix on the cheap cause the wife just lost her job.... please help!!!!!

Thanks in advance

Premium72 · 11-19-2007, 10:34 AM

check your timming it may need to be adjusted becuase of the cam(mine did). if its not getting fuel, maybe check the fuel filter, an spray some carb cleaner down the through of that beast...all thats real cheap, if not close to free!

Hooker · 11-19-2007, 11:04 AM

I Will Try That When I Get Off Work And Get This Beast Home Today.... Thanks... Any More?

69halfton · 11-19-2007, 11:08 AM

is the choke opening up?....could explain why it dies once warm, but not when it cold...

Hooker · 11-19-2007, 11:22 AM

i got a manual choke on it now.... i just changed the choke to manual last week...

hvychve · 11-19-2007, 04:04 PM

couple of possibilites come to mind, first I would look down throat (engine OFF) and open the throttle a couple of times, you should see a couple of steady squirts of fuel, this is your accelerator pump, If you have no squirt, either your float bowl is running out of fuel or your accelerator pump is dried up or check ball sticking etc.....
How is your idle speed , is it adequate in gear???? engine isnt missfiring is it??? running on fewer than eight cyliners????

**slomotion** · 11-19-2007, 04:50 PM

Is this a crate Vortec? If so, you need to either let it warm up longer, or put on a heated intake manifold.

tim21391 · 11-19-2007, 05:53 PM

my truck had a similar problem.....i replaced my fuel pump...spark plugs....and spark plug wires...i then dumped some sea foam fuel treatment down my tank and down the carb......runs great now.....i also started running premium gas and that took away some problem of mine....gives you better passing gear capabilities in my opinion

tim21391 · 11-19-2007, 05:55 PM

my truck is a 1972 chevy...402 big block...

11-19-2007, 09:25 AM	#1
Hooker aka TEX-TOY Join Date: Jan 2007 Location: Kentucky Posts: 127	Stumble on acceleration Got a question for you guys... i am a little stupid when it comes to these things but i seem to be a quick learner.... my truck after warm up in the drive way seems to have a stumble on acceleration and after it has been driven for a while dies while at a light.... it is a 350 350 combo with a slight cam and a street avenger 670 carb.... i need a fix on the cheap cause the wife just lost her job.... please help!!!!! Thanks in advance __________________ 1969 Chevy C10 SWB w/ disk brakes and soon to be lowered with spindles and springs!!!! Getting a paint job like a Army Chinook Helicopter!!!! HOOKERS RULE!! BRAND NEW WIFE BOUGHT IT FOR ME AS A WEDDING GIFT!!! SHE IS THE BOMB!!!!!!

11-19-2007, 10:34 AM	#2
Premium72 Registered User Join Date: Sep 2005 Location: Villa Rica Ga Posts: 889	Re: Stumble on acceleration check your timming it may need to be adjusted becuase of the cam(mine did). if its not getting fuel, maybe check the fuel filter, an spray some carb cleaner down the through of that beast...all thats real cheap, if not close to free! __________________ WombatFire, Art-Design-MADNESS Follow My Build and Adventures on Instagram

11-19-2007, 11:04 AM	#3
Hooker aka TEX-TOY Join Date: Jan 2007 Location: Kentucky Posts: 127	Re: Stumble on acceleration I Will Try That When I Get Off Work And Get This Beast Home Today.... Thanks... Any More? __________________ 1969 Chevy C10 SWB w/ disk brakes and soon to be lowered with spindles and springs!!!! Getting a paint job like a Army Chinook Helicopter!!!! HOOKERS RULE!! BRAND NEW WIFE BOUGHT IT FOR ME AS A WEDDING GIFT!!! SHE IS THE BOMB!!!!!!

11-19-2007, 11:08 AM	#4
69halfton Registered User Join Date: Apr 2007 Location: King City, Ontario, Canada Posts: 974	Re: Stumble on acceleration is the choke opening up?....could explain why it dies once warm, but not when it cold... __________________ - Jason If you can turn, Youre not going fast enough. Favorite caption: first car to 200 mph in the 1/4 mile, no parachute, drum brakes all the way around.. ..back when men were men.

11-19-2007, 11:22 AM	#5
Hooker aka TEX-TOY Join Date: Jan 2007 Location: Kentucky Posts: 127	Re: Stumble on acceleration i got a manual choke on it now.... i just changed the choke to manual last week... __________________ 1969 Chevy C10 SWB w/ disk brakes and soon to be lowered with spindles and springs!!!! Getting a paint job like a Army Chinook Helicopter!!!! HOOKERS RULE!! BRAND NEW WIFE BOUGHT IT FOR ME AS A WEDDING GIFT!!! SHE IS THE BOMB!!!!!!

11-19-2007, 04:04 PM	#6
hvychve To The Levy Join Date: Jan 2007 Location: california Posts: 391	Re: Stumble on acceleration couple of possibilites come to mind, first I would look down throat (engine OFF) and open the throttle a couple of times, you should see a couple of steady squirts of fuel, this is your accelerator pump, If you have no squirt, either your float bowl is running out of fuel or your accelerator pump is dried up or check ball sticking etc..... How is your idle speed , is it adequate in gear???? engine isnt missfiring is it??? running on fewer than eight cyliners????

11-19-2007, 04:50 PM	#7
slomotion Old Duffer Join Date: Mar 2003 Location: Maine Posts: 1,821	Re: Stumble on acceleration Is this a crate Vortec? If so, you need to either let it warm up longer, or put on a heated intake manifold. __________________ '68 Short C20 Flatbed Dually w/ 292 4bbl, Langdon cast headers, and WC T5 trans. '81 G10 Shorty Van "Good judgement comes from experience, and a lot of that comes from bad judgement." Will Rogers "Under promise, then over achieve."

11-19-2007, 05:53 PM	#8
tim21391 Registered User Join Date: Jul 2007 Location: Salina, Kansas Posts: 1,998	Re: Stumble on acceleration my truck had a similar problem.....i replaced my fuel pump...spark plugs....and spark plug wires...i then dumped some sea foam fuel treatment down my tank and down the carb......runs great now.....i also started running premium gas and that took away some problem of mine....gives you better passing gear capabilities in my opinion

11-19-2007, 05:55 PM	#9
tim21391 Registered User Join Date: Jul 2007 Location: Salina, Kansas Posts: 1,998	Re: Stumble on acceleration my truck is a 1972 chevy...402 big block...



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