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Re: 97 4.3 engine misfire
Also check for vacuum leaks - bad grommets, cracked hoses, hoses to sensors, etc. - Had a '96 Lumina with 'random engine misfire' codes and found 1) a crumbled manifold gromet and 2) a leaking hose going to the MAP sensor. Might also check the high voltage plug wires, rotors, plugs to make there in good shape, not shorted, etc.
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