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    1985 150 mid to high speed surge

    Hello all I'm new here, I'm a DIY "tech" I'm having some trouble in resolving a mid to high speed surge that I believe to be cylinder 5 intermittently firing on an 1985 Yamaha 150 v6 on a bass boat, I believe its cylinder 5 due the the visual condition of the spark plug, the plug is appearing...
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