Question about 1991 GMC C1500
It sounds like you may have an intake leaking. You've replaced the major components so now you need to look for a possible vacuum leaking. The intake gaskets is the easiest part to check. Get a can of brake clean. While the engine is running, spray the brake clean on the top center of the engine. The engine may idle up or idle down or may smooth out. Try this and see what you come up with. If this does not solve you problem, let me know and I will help you figure it out.
Posted on Jan 06, 2009
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Posted on Jan 02, 2017
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