Question about 1991 GMC K2500

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1991 GMC sierra stalls

I have a 1991 GMC Sierra 350 5.7L. It runs really really rough on start up, when the weather is warner it runs better, not good, just better. I have replaced plugs, wire, pick up coil, ignition coil, rotor and fuel filter. I am stumped on this one, i usually am pretty good at working on vehicles, but i am at a loss of ideas. I have heard that it could be your Oil Pressure Sensor, retarding your firing? After i warm it up it will not run that bad but off the jump it does, for example when i take off onto the highway from the access road i have to punch it because if not it will bog down bad and accelerate and a very minimal speed. HELP

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Bad coolant temp sensor,or idle air control valve, and possilbly just low fuel pres.

Posted on Nov 03, 2008

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SOURCE: 1991 GMC TBI 350 sierra stalls bad

check all your vacum lines on you TBI for cracks

Posted on Aug 09, 2008

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