I have a mercury 75hp 2 stroke. I was on the water recently and I was docking up and it died. Well after that I went to start it back up and it wouldn't start. So I floated a while and deciddd to try again. It fired off it was just super boggy. And wouldn't go full throttle. About 10 seconds of it running again it died and never started again. Mind everyone it ran for about 3 hours before all this happened. Any idea what could be wrong? I check spark plugs.
