My 1992 75hp 3 cyl runs perfectly on all three cylinders making full power for 5-10min then runs smoothly on two cylinders making much less power. The third cylinder will cut in and out sporatically. If I then idle for 10min then the third cylinder will kick in again and run perfectly for a minute or two, then back to two. I have changed the plugs, all new fuel and fuel filter, typical maintenance stuff. I am lost, what would tend to die when the enigine is warm to cause this?
