1985 85HP Force outboard problem

cookiedude87

Recruit
Joined
Jul 30, 2010
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5
Hello my outboard starts up perfectly and idles decent... When under a load and putting through the water or about 1/4 throttle it shakes real bad and sounds rough like the engine is missing. Full throttle runs perfect.. I was told it could be a ignition coil so i pulled the plugs off while idling and the weakest cylinder i figured to be a bad coil. well i switched the coils and same issue.. I can pull two of the three wires off and motor will still run on one cylinder except for the top cylinder.. For some reason this cylinder doesnt seem likes its is firing strong or producing alot of power.. It is getting a spark though.. Any ideas??????? Please help
 
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