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1995 Chevrolet 1500 Pickup Question: what is causing my truck to have a high idol when warm its at 1500. When I start

 

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DerekV, 5.7L V8, Redmond, WA, May 16, 2013, 13:30
 Rookie

it cold the idol is about right tell it warms up and jumps to 1500. I have changed idol control valve and throttle control valve also, but now change.

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  • Answer #1

    May 16, 2013, 15:17
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     Master

    Vacuum leak, suspect throttle body mounting gasket. Common problem on this vehicle.

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