i have a 1985 70hp evinrude 3cylinder motor on my boat. Having a hec of a time trying to fix intermittent missfire. runs between two and three cylinders in the 5mph zone. if you catch it on 3 you can get on a plane and go until it decides to run on two again, it then slows the boat to idle speed.On two you cannot give it throttle very much over idle or it dies. i have got it to run at full speed on and off for a few hrs. Compression is 118 120 110, i have replaced coils, timing base, electronic ignition module, pulled the carbs, no dirt anywhere all flowing through the jets. checked the stator with an ohm meter 1.5 on the yellow wires, .547 on the brown/brown yellow which is from what I can find reading of a good stator. plug wires give a reading of .5 not sure what normal is there. on the last tryout i put new plugs in it, ran good for about half a mile. made it back to dock on two cylinders. pulled the plugs top two were black. bottom plug was still white. I am completely stuck as of what to try next. any help would be appreciated very much, thanks
