1992 chevy lumina 4 door. what might be wrong?

  • Thread starter Thread starter John H
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John H

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when i press the gas pedal and rev up, it sounds like it don't have a muffler, also there is a knock in the intake manifold. there is no power and it just sounds like no muffler. i know its not the bearing or the engine. it got to be something else. its the muffler like sounds that's weird. what could it be.
 
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