2008 90 HP Mercury four stroke (1B707931)
The #1 cylinder, if thats the top one, is not firing on this engine. I've swapped coils and spark plugs with the cylinder below it and the problem did not follow. I can unplug any of the other three coils with it running and the engine dies. The engine does not change when I unplug the top coil. Any help or direction is appreciated.