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    5.7 Mercruiser Thunderbolt Ing. Backfires thru carb at 3000 rpm Help??

    Have a 1999 Bayliner 3055 w/twin 5.7 Mercruiser. One engine backfires thru carb at 3000 rpm. I had carb rebuilt, replaced fuel filter, put on new dist cap and rotor, new coil, new platinum plugs, still the same. I had a friend in the engine room while running and making it backfire, he removed...
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