Unburned fuel and alarm

kbgolf1kbgolf1 Member Posts: 17
I have unburned fuel coming out of my port side engine.  Engine starts and will run for about 10 mins (give or take).  I have a loss of power (at 3800 RPM's I usually hit about 20 knots and I am only hitting 16 knots now).  Mechanic has been here a couple of times and replaced the spark plugs, distributor cap and rotor.  Anybody have this issue in the past?  Could it be cam/crank shaft position censors and/or a timing issue?

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