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    Mercruiser 3.0 only starts if i remove any one of the 4 spark plugs

    Long story, I'll try to make short. Bought a project boat last year, gutted and restored the deck and interior. Motor is a 1986 Mercury 140 3.0. Replaced the starter, carburetor, head gasket, plugs and wires. Started it up two days ago, ran great, took it to the lake for the first time. Ran...
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