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Hi. I have a 2000 mercruiser 7.4l mpi s/n 0M023416 with bravo 1 drive. 120 hours on it. It has steadily lost power to the point it will no longer get on plane. It starts ok. Idles ok. But you can tell it's rough. There appears to be no change when cylinders 6,8 plug wires are pulled from the...