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Engine Runs Real Rough When Cold

BIGBLUE1991

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BIGBLUE1991 New Member

BIGBLUE1991

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I have a 1991 Chevrolet Cheyenne L31 5.7L (350ci) and when you first start it the engine run normal and then almost goes to a stall (some times it does stall out) for about a minute or two and then the idle smooth out when it warms up,but still doesn't work quite normal( like its not getting enough gas or something). For example when it accelerates it cuts out when you first give it some gas then opens up when still now up to operating temp and even when the truck is at operating temp it accelerates like it fuel is being restricted or the spark is breaking down . The engine came out of a Cheyenne of the same year and had about 300,000 kms on it so we changed the fuel filter and fuel lines,air filter and ran carb medic trough the engine. It had some what improved the problem some but still didn't cure it. So know I changed the plugs and gaped them and changed the o2 sensor that practically crumbled in my hand.... now since I changed the plugs and o2 sensor I've put about 400 kms on the engine and seem to be getting better but have a feeling a senor is still not working or maybe have a bad throttle body and even the timing could be possibly be out some.

 

If any one has any recommendations,tips or ideas what maybe causing the problem I would sincerely appreciate it!!!!!!

 

Thanks, sincerely

Tyler Inman

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