Low compression caused by leakage from exhaust valves can cause the check engine light to illuminate indicating an engine misfire. The cylinder head will need to be rebuilt by a qualified machine shop if possible. Please note that this problem will require careful diagnosis because misfires can also be caused by basic ignition components like spark plugs, coils, etc.
Engine Misfires, Check Engine Light On on Mercury Marauder
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engine came on dealer said fuel pump replaced it engine still on and still sayin fuel pump replaced it twice