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I have a 1985 18 Outrage with a 150 Yamaha 2 stroke....She seems to be running very rough even when warm and at some points seems to almost want to cut out....Often times I have loss of power and acceleration to the point where the boat cant even make it up on plane. I thought plugs may be fouled, but then realized if they were, this problem would be happening all the time and not just every now and then....My next conclusion would be moisture in the fuel.....My local Yamaha dealer cant say enough about the importance of a fuel/water seperator...What is your guys opinon? Is a fuel/water seperator as important as my local mechanic says?....Does my brief description of how my motor is running sound conclusive with having moisture in the fuel?....