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    2003 Mercury 90 HP 4 Stroke Only Running on 2 Cylinders

    Good Morning - I recently bought a 2003 90 HP 4 stroke Mercury outboard. It idles very rough. I can run it at high idle. I changed plugs and checked for spark. When I pull the 2 middle plugs there is no effect to its running. When I pull the top or bottom plug it dies. The fuel filter had a...
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