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  1. S

    Help Injector problems 1999 Merc 7.4L

    I have a 99 7.4 L Mercruiser that is in the shop for service. It had a ruff idle that gave a little pop here and there. Under a load it was running worse. I have a friend that looked at the boat and thought the #7 injector was probably plugged (we change the spark plugs and after starting #7...
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