Ok, I have a 18ft Tahiti with a 454 (stock to my knowledge) with a berk 12jg pump. I picked up the boat and it ran but would flood and cut out like someone turned the key off. Rebuilt the carb (850dp), and found the dist was bad, replaced that. No more cutting off except for when I let out of the gas like its flooding. So I pulled the 850 off and put a 750 on still the same, runs a little smoother but still won't idle?? By smoother I mean better pick up and lowr rpm"s at the same speed?? HELP!!!