Question about 1994 GMC Sonoma

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Have a rough idle that seems to be from a carbon build up any way to solve this

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One way to try to decarbon is with air cleaner removed run the engine until hot rev up engine to about 2,000 rpm and pour some water ( a couple of quarts ) down into the throttle body pour as fast as you can without stalling the engine.This will create steam in the combustion chamber loosing up some of the carbon deposits .You may have to repeat more than once.. Then after drive on highway a little to help blow out...

Posted on Oct 03, 2010

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