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I have a question for anybody who can answer it. My 1990 gsx galant is making a vibrating noise when the rpms go over 3 or 4 in 1-3 gear. someone told me it could be the manifold...(exhaust or intake manifold i have no idea which). And i'm wondering if this could be the problem. once i hit 4 and 5 gear the car run great but below that it just runs like crap. If anybody can answer my question please let me know.
probably a timing belt issue. You more than likely have a balance shaft out of time, or a have a broken "b" belt.
have it checked IMMEADIATLY. If your about to toss a timing belt, you will destroy your engine.
check your engine mounts too......i had two busted ones and almost the same problem....does it feel like it is gonna shake apart when you are at a stop?
mine was doing the same, it was the transmission(automatic) havent fixed it yet