I have a 16' maxum that was taching @ around 5000 then suddenly lost power at WOT and now gets only 3500 on a good day. used to pull a tube and rider with 3 others in boat now won't even pull tube with just driver. 120 lbs on all 3 cylinders for compression. fuel ines clear and pump works fine. any help would be appreciated. Idles kinda rough but runs smooth at 3000 rpms. top cylinder plug kinda black.
