Boat stuttering/stalling

[MokiCruiser]

Hopefully someone can help. I have an older 1976 Sea Ray with a 302. Bought this last year and have had it out about 7 or 8 times. It has a lot of power and more speed than I need ..... upwards of 42 mph. That is when all is well though. All the times we took it out without a problem was when we used the main motor sparingly and used the kicker all day to troll. The two times we used the main 302 all day was when we went crabbing and both times the same problem. When we crab the main motor is on all day either at idle or very low crawling speed from crab pot to crab pot. After an hour or two I can no longer accelerate from crawl speed without the motor sputtering and trying to or actually dying. If I play the throttle .... a little forward till it almost dies and back and forward and so and so, I then seem to clear out what ever is causing it ..... it almost feels like its dumping too much fuel at one time and flooding and only by "playing" the throttle can I clear it and then able to accelerate ...... sometimes. Saturday it got dangerous. I couldn't get it started and the wind kicked up .... strong I might add, pushed us up against a wall of pilings and by the time we finally cleared the last one as we tried to repeatedly push off the pilings with our boat hook and hands, I was finally able to get the motor started and could play it until I could get it cleared. I'm no mechanic but it sounds like maybe something in the carb. Float, jets maybe? HELP.