I had the boat in reverse today, and when I hit the throttle I heard a pop. When I put it in forward, It was fine at idle. I hit the gas and the engine just reves. I took it to the dock at a little over idle without problems. What do you guys think it is, a seal or something? Dosent make any bad nosies, just wont hook up. It is a 2002 Legend pump in a 21 ft bowrider. PLEASE HELP.