I have a 2004 200HO that is miss firing below 1000 rpm's, I would get this problem since I bought the boat and motor new. When it would happen, may-be once a year I would change the plugs and it would run fine. Last year toward the end of the session (after the warranty was up) it started misfiring again and I changed the plugs but the misfire did not clear up. Took it to my dealer and he said it was probably carbon-ed up. So they sprayed 3 cans of engine turner through it and it ran good for about 5 miles and started misfiring again. I changed the plugs again and it is still misfiring. When I run and come down to idle the motor doesn't miss for about 40 seconds but then starts missing again. Any ideas on what the problem could be?
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