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What is causing my truck to have a high idol when warm its at 1500. When I start

(1995 Chevrolet 1500 Pickup)
in Redmond, WA on May 16, 2013
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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Popular Answer
on May 16, 2013
Vacuum leak, suspect throttle body mounting gasket. Common problem on this vehicle.
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