1991 Chevy Truck fuel system

1991 CHEVROLET TRUCK
200,000 MILES • 6 CYL • 2WD • AUTOMATIC
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JEREMYJOHN
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my question is this my s-10 idle's so high that it even makes it difficult to get it into park the truck has no engine light so i'm unsure how to get a problem code myself without taking it somewhere how can i get the engine code if there is one and what might be the problem with the idle?
Feb 13, 2008 at 11:15 AM
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2CARPRO JACK
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91 is throttle body injection..... CArefully spray around the TBI unit with carb cleaner for vacuum leaks, spray all lines if the idle changes you have found a leak. Coulsd also be the Idle Speed Control Motor, this is a big round motor on the P/S of the TBI unit with a square 4 wire connector, might be stuck
Feb 13, 2008 at 11:27 AM