"My 1989 3.7 Liter, 165 HP Mer
"My 1989 3.7 Liter, 165 HP Mercruiser Stern Drive runs great for about ten minutes. After that it sputters, continues to lose power, and hesitates big time. So far, to try to resolve this, it has been tuned up with new plugs, points, wire harness, distributor...