I have a 199? 400 Foreman that would start and run good. I retrieved a deer from rugged wood and loaded 4 wheeler on trailer. when I got home gas was pouring from overflow on carb. I turned gas off at tank. next day turned gas back on and gas did not run from overflow, however when you start engine it sounds like a 2 cylinder running on 1. engine will not rev up and will not idle. 1/3 throttle is only place the engine will run. would a carb cleaning help this or does this sound like more. I am 71 and do a little tinkering but not up to major rework.