i have a 1985 bayliner capri with a 85hp force on it. boats ran great for years but had a little trouble last year. i put it in the water last weekend. it started up immediatly and seemed to run great at first, after about 10 minutes of runniing great even at full trottle it began to sputter which just got worse and worse the longer it ran. i docked and left it alone. the next morning i started it up cold and it ran amazing with no problems. but after about ten minutes it started to sputter more and more. its seems that it runs great cold but the longer it runs the worse it get. anyone have any idea on what the problem may be?