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Low RPMs/Top end Speed 7.4 MPI Mercruiser

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Hello Gents Ladies,

I have a '98 Sig 29, single screw 7.4 MPI Mercruiser, and am having issues with my RPMs/Top end speed.  I replaced fuel separator last week and have changed spark plugs and wires twice. Runs great for 1st outing after replacement, 4400-4600 RPMs/28-30mph, but the next trip out my RPMs won't get over 3200 RPMS/12-13mph.  Could this be from bad gas? Use Stabil at each fill-up but continue to have the same issue. The plugs seem to foul quickly. Thanks in advance for any assistance.

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