Question about 1992 Chevrolet C/K 2500
Your truck should have throttle body injection. Most of the electronic issues that will cause a high idle will turn on your check engine light. If it's on read the codes and check it accordingly. If it's not on then you most likely have a vaccum leak. The most common by far is a failed base gasket for the throttle body. Second is the hose for the PCV valve failing and splitting. You can check for these leaks by using some water in a spray bottle. Spray the water at the suspected leak while the engine is idling. If it's leaking you will hear the water getting sucked in or the engine note will change.
Posted on Sep 23, 2008
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