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  1. BigSkyMercGuy

    1989 Merc5 runs - full speed, then gently slows down

    New Forumite here. The story: Warmed up, I can take it at full speed across a lake, then in about a minute it slowly decreases in RPMs, down to a putt-putt troll speed, but throttle handle is wide open. (Not sure, but I think it'll eventually stall out). Spark plug is new and gapped. New gas...
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