Just bought a 96 SP last week. It had been sitting for a couple of years but stated right up. Went through a tank full of old gas without any problems. Filled up with some new gas went out for about 45 min and it stalled and would not start up. Dragged it back home and after about 2 hours of sitting was able to get it started again but it was running rough. Went back out and the same thing happened after a half hour. Help, what is going on. With my boat it was water in the fuel. Could this be the same thing or maybe old debris from the old gas.