Re: 1973 20' SF - Engine Trouble?
After your previous attempt to decarb with Powertune, I have to agree with Big. Pull it down and re-ring the cylinder, with a new piston if necessary, and at least carefully inspect the others. A little work now can save you a lot of money later.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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