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97 Tantrum-320 not running right

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Hey Guys, I have a 97 Malibu Tantrum, 660 hours, have owned it for 2 years. Running into some issues this year. At wide open it seems to just back off and lose power. I let the boat sit for 5 mins, then we were good to go for a while. I suspected bad fuel from last year that I may have forgotten to stabilize. So I drained the fuel and tried again, still not 100% right but better. It is also throwing a lot of white smoke (out of water with fake a lake) that I couldnt get to go away. 

Because I was due for maintence, I have just replaced spark plugs, oil change, fuel and oil filters, still not quite right. The smoke is concerning me. I used Seafoam last year at the end of the year and didnt do that before. Would seafoam cause this issue? Am i looking at cracked heads or an injector issue?

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