I am trying to get a friend's boat going. It runs fine on earmuffs in neutral and in gear. When he puts it into the water, it runs fine in neutral, but when he puts it in gear the engine dies. This boat was running fine one weekend then the next this was happening.I have pulled the carbs and cleaned them, but this hasn't fixed the problem. Anyone have any ideas? I am a former motorcycle and snowmobile mechanic, I have limited knowledge of outboards other than basics. Any help will be greatly appreciated.