I fished a tourney on st clair sunday and on the way out we were running 40mph and the motor bogged and we went down to 25mph but it sounded normal just no power , when we slow down you can feel the 3rd cylynder kick back on and start powering the boat it works fine at idle but as soon a you throttle it it boggs down I think it's a coil/plug or a carb/fuel prob . I am just looking for advice before I take it in hope this is the end of my engine issues it's only a year and a half old