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Chevrolet Silverado 1500 Forum : “engine runs rough for about 2 minutes after starting eitherwarmed up or cold hav...”
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About: 1999 Chevrolet Silverado 1500 3 Dr LS Extended Cab SB
engine runs rough for about 2 minutes after starting eitherwarmed up or cold have no check engine warning what could be causing this ?
This problem has been ongoing for 3 years, I have a new fuel pump and the pressure is good. The truck isnt throttle responsive till it clears its throat and that takes about 2 blocks or a warm up of about a minute ir two. It backfires when trying to drive off immediatly after starting.
Sounds like either the Idle Speed Controller/Idle Air Control, Mass Airflow sensor, or intake air temperature sensor may be causing your stumbling problems until the vehicle heats up.
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