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Youngz

Back fires and loss of power at WOT

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Could use some input.  Seems like when I am under 1500 rpm I can feel the engine surging a little.  Then when I opened it up I only get 3500 rpm and 35 mph.  Normally it’s 5000 rpm and 50 mph.  I put sea foam in to help if bad gas is issue.  I also had all new spark plugs put in.  Still does it.   Anything else it could be or maybe if bad gas I just need to run it all out and refuel .  It’s a 350 Mag MPI mercruiser 

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No fuel additive will "fix" bad gas. It will extend the life of quality fuel, but once contamination or phase separation has occurred, the full needs to be removed and replaced. You issue sounds like a bad distributor cap and rotor to me.   W

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If you haven’t replaced the distributor cap and rotor button lately it would be good place to start. The marine environment is hard on them. 

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