1989 GMC Sierra fast idle after engine is warmed up

1989 GMC SIERRA
200,000 MILES • V8 • 4WD • AUTOMATIC
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SWORDFISH
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engine turns over for about 10 seconds then finally starts seems to run ok and restart ok but won't come off fast idle engine is at operating temp, then gradually comes to a normal idle until i restart it and does it all over again checked linkage and for intake leaks, both seem ok. after engine is shut off for about 15 minutes it starts hard again...
Feb 25, 2010 at 5:26 PM
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RASMATAZ
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Clean out the idle air control valve and see what happens
Feb 26, 2010 at 3:33 AM
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SWORDFISH
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etc sensor was bad , 10 dollars later it ran great
Mar 12, 2010 at 1:37 PM
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RASMATAZ
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TY for coming back with the fix
Mar 12, 2010 at 2:33 PM