Idleing rough

Asked by groundman Dec 06, 2015 at 09:24 AM about the 1999 Chevrolet C/K 1500 LS Extended Cab 4WD

Question type: Maintenance & Repair

I have 1999 chevy silverado with 5.7. Motor runs smooth until you come to a stop.
The idle drops to barely  running and is rough. Take off and runs well. Why is it
running rough at a stop

2 Answers
103,445

KenF answered 9 years ago

A bad Intake Air Control (IAC) valve has this symptom. Wouldn't hurt to clean the throttle body and MAF sensor, clean/replace air filter.

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