Question about 1991 Chevrolet C1500

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I have a 1991 chevy 1500 ext cab with a 350 motor

I have a 1991 chevy 1500 ext cab with a 350 motor and i noticed that when it idles it revs up and then down constently. What is wrong with it? What should i do?

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You could also check to see if the idle valve is open and the seal around it is broken

Posted on Feb 13, 2014

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Check engine light on? Does it run normal driving it? Sounds like a vacuum leak. Check the gasket under the throttle body.

Posted on Jun 05, 2010

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