I was out at sinclair today for the first time in several months. My boat cranked up fine, but when I went to accelerate I pushed the throttle down all the way and it ran for about 2 minutes then the motor shut off. After that I could not run the boat more than half throttle or the motor would shut off. After fishing for awhile, it took me an hour to get the motor cranked back up, and once it cranked I could only go barely above idle. I noticed alot of oil/gas coming from around the prop. What could be the problem and how much of a repair bill am I looking at? Thanks.