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I have a 91 90 hp it's started to have a what I would call a hi spd shudder. I can take off from the dock and run a 1/2 mile or so then can only get to 2800 rpm or the motor shudders for better description, doesn't seem to be backfireing or missing. can only go about 2800 rpm Later in the day going home it ran about 5 miles at WOT never missed a lick Doesn't seem to miss or backfire Changed the fuel water seperator no help.