i have a 1992 Mecury 15hp 2stoke electric start. I need some help trying to figure out what is wrong with it. Yesturday I went out for a couple of hours and while I was motoring across the lake at a break neck speed it just died. In order to get it back to the truck I had to pull the choke out and run it at nearly full throttle. other times it won't start or as soon as I put it in gear and start to take off it dies, It sounds like it bogs down and dies. Any suggestions.