This is a 1989 Mercury (under Sea Ray label) 100 h.p. When I give it full throttle, sometimes 4 cyl. will kick in and sometimes not. Occasionally, even when running FOT on all 4 cyl., it will drop back to 2 cyl. I use this boat at 8,300 ft. altitude.<br /><br />The dealer has changed plugs, rejetted, changed fuel filter without results and finds nothing else wrong. <br /><br />I called the Mercury tech. advisor and he suggested replacing the trigger, coils, or stator. <br /><br />Are these equally likely culprits for the symptoms the engine has? <br /><br />If I'm going to replace one at a time (to save $$), in what order should I do this? <br /><br />Is it worth buying some test equip. before replacing these parts?
