i have a 1990 prostar 190 with a 351 engine. the boat runs great at idle and cruising around the lake. the problem is if i run it at full throttle is will go like crazy and then suddenly starts loosing power and seems to pop back out of the carb. if i let up on the trottle it seems to catch back up to itself and runs great again until it is run back to wide open. almost seems like it is running out of fuel at the top end. anyone experienced this? any suggestions would be appreciated.