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    1989 3cyl 90hp merc runs wierd

    this motor will usually start pretty well but will idle with only 2 or the 3 cylinders running. If I use the fast idle it sounds good and will go all the way up the tach but as soon as it's put into gear it will go back to 2 cylinders and only get up to 2500 rpms WOT. Every once in awhile you...
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