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  1. K

    Mercruiser 350 MAG MPI missing only at 3000 rpms

    Update: I ran boat at night. Did not see any wires arcing against block. I did have the old 50amp fuse with yellow flag, I bypassed that and nothing changed. It now seems like I have an intermittent high pitched slapping/firecracker popping even at very high rpms. It reminds me of the sound my...
  2. K

    Mercruiser 350 MAG MPI missing only at 3000 rpms

    Thank you. I will check this out. Funny thing is I did have a new alternator put on. I bought the boat and had delivered. Never ran it personally before i had it serviced. Took it to shop and they made all the repairs above. So I can't compare before and after.
  3. K

    Mercruiser 350 MAG MPI missing only at 3000 rpms

    2009 Harris Grand Mariner 250 SEL Tritoon Mercruiser 350 MAG MPI Bravo III serial: 1A335811 300 hours Engine misses/hiccups only in a certain RPM range around 3000 to 3500. At idle and higher throttle it seems to run fine. It only misses or hiccups in that middle power range on throttling up...
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