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

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.

by in Redmond, WA on May 16, 2013
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1 answer
ANSWER by , May 16, 2013
Vacuum leak, suspect throttle body mounting gasket. Common problem on this vehicle.