sputtering?

[79widestep]

ok i got a 93 blazer with a 4l60e from mad dog transmisson with a stage 2 shift kit this lil sputtering issue i just noticed the other day i was gettin on the highway so i floored it to get up to highway speed since people werent gettin over and right when the transmisson get ready to hit for the shift the it starts sputtering like its boggin down from to much gas so i back out of it and it goes away and runs normal just so it wasnt a fluke i did it again and the same thing happned but other wise the truck .. hmm i guess it not a truck i guess its a suv hmmm .. well any was it runs just fine except for that lil issue im not sure what it could be

[TennesseeZ]

Sounds like the inline fuel filter is clogged.

[ChevLoRay]

I had an issue once when the coil wire on my old Pontiac started breaking down under acceleration but worked fine otherwise. A set of plug wires and all was good.

[79widestep]

Originally Posted by ChevLoRay

I had an issue once when the coil wire on my old Pontiac started breaking down under acceleration but worked fine otherwise. A set of plug wires and all was good.

im gettin ready to change the spark plugs and wires this week end seeing i havent change them since i bought her lil over a year ago so maybe that will fix it

[Big J'72 GMC]

I'm having this same problem with my '96 Suburban. Changed the pulgs, wires, and fuel filter and its still acting up. Took it to my tranny guy who did a diagnostic an he said that its not my tranny he thinks it might be a computer problem. Gonna try putting in a piggy back system this weekend to see if that'll help. Any other ideas?

[ChevLoRay]

Is your Check Engine light on?

Can you get it read somewhere?

[ChevyTech]

It sound like both Widestep’s, and Big J’s trucks could have a restricted exhaust system.

And like ChevLoRay said, see if there are any trouble codes in the memory.

[79widestep]

nope i dont have any lights on indicating that somethinngs wrong and for exhuast im runnin glass pack which i dont like with the stock exhaust manafold

[GASoline71]

When I bought my 1994 GMC 1/2 ton... it kinda did the same thing. Pulled the cap off of the distributor, and it was pretty messed up with carbon tracks, and all boogered up on the terminals. So... new cap and rotor, plugs, wires, and a new fuel filter. Made a big difference... but still did it once in awhile to a point it was gettin' a little annoying.

Then I installed an MSD coil... no sputtery no more.

http://www.summitracing.com/parts/MSD-8226/?rtype=10

Gary

[JWall]

My 98 had a bad miss in it at cruising speeds a while back I did a tune up on it but I did the parts 1 @ a time so I could figure out what the problem was & mine was the plug wires.

Since everything on the truck was original when I got it for the tune up I did plugs, plug wires, dizzy cap, fuel filter, fuel pump (my guage wasnt reading correctly), & an engine temp sensor obviously after all that it runs like a champ now!

[ChevyTech]

It could have a trouble code stored without have the check engine light on.

You have glass packs, but is the catalytic converter removed or is it still there?

You could test the fuel pressure and make sure it is within spec.

I agree with the others that it could very easily be and ignition problem. Do consider the ignition coil because they do have their share of failures.

[79widestep]

Originally Posted by ChevyTech

It could have a trouble code stored without have the check engine light on.

You have glass packs, but is the catalytic converter removed or is it still there?

You could test the fuel pressure and make sure it is within spec.

I agree with the others that it could very easily be and ignition problem. Do consider the ignition coil because they do have their share of failures.

there is no catalytic conveter i just checked and how much fuel pressure should i have and i tried to get it to bog down again today but it ran normal so maybe some trash in the gas i dunno much about the motor side of these trucks ...

and how much of a differnce does a MSD coil make.... is it a esy install never messed with one before

[ChevyTech]

Originally Posted by 79widestep

…how much fuel pressure should i have ….

The TBI fuel pressure specification for small block Chevy’s is 9 – 13 PSI with the truck running.

C/K truck TBI systems do not have a fuel pressure test port, but the pressure must be tested with the engine running. The fuel pressure is tested by using fittings to “T” in a pressure gauge.

Originally Posted by 79widestep

…and how much of a differnce does a MSD coil make.... is it a esy install never messed with one before

The only experience I have with them is removing them and putting stock equipment back on the vehicle.

[GASoline71]

Originally Posted by 79widestep

and how much of a differnce does a MSD coil make.... is it a esy install never messed with one before

The one I installled in my truck was a direct bolt in replacement for the factory coil. I can post a pic of it if you want. I did mine in about 20 minutes. EZPZ... They have more windings in them and put out a higher spark.

Gary

[79widestep]

well guys i changed my plugs and wires today and it seems to be runnin better it hasnt bogged down any more excepts that few times but i noticed the gasket under the fuel injectors assyemble as blown out on one part of it i found some peices early this week but didnt know where it came from sorry crappy pics from cell phone this will be a easy fix but my question is will it cause any probs in the mean time till i get it fixed my dad said might act like a vacum leak im wondering what yall think

[Metal]

I'm betting your just sucking in unfiltered air.....

[bwood]

You are possibly sucking some unfiltered air, but the leak is before the throttle blades/IAC so it really shouldn't act or give symptoms like a vacuum leak. Here is a link to Oreilly's for the part # on that gasket:

http://www.oreillyauto.com/site/c/de...&keyword=60038

[79widestep]

ok thanks bwood and that does make sense about just unfilterd air thanks for all the helps guys

[GASoline71]

Yep... the gaskets get old and brittle after years and years of sitting with gummed up crud on them. Pretty common, and will do as decribed above. No performance loss from it.

Gary

[Big J'72 GMC]

When my check engine light comes on it flags all four O2 sensors, not sur ewhat to make of this, never thought of a restricted exhaust