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  1. J

    2004 5.7 Mercruiser Mag MPI won't fire, at my wits end.

    In need of some help figuring this out. My 2004 Mercruiser 5.7 Mag MPI cranks but won't fire. It cranks and will try to catch a couple of times but won't actually run. When I ground a plug on the block, it gets strong spark when it tries to catch, but not when it is just cranking on the starter...
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