2002 Challenger 240 m2 EFI fouling plugs

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jamesstyle112

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Hi there, bought this boat from a buddy and it runs great at high rpm but bogs and fouls plugs at low rpm and towing. It is very embarrassing and needs to be fixed. Someone told me the oil injection system is set to rich. Is there any way to adjust this myself? I have called a couple dealers and they are clueless on this boat. I run the correct Mercury oil and the boat is in very nice shape. Any help is or advice would be great!
 
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