Ihave a 67 seahorse, model # CD-24D. I was out on the lake yesterday, motoring along, when the motor just kind of wound down to nothing, at wot, and died. Any help would be appreciated. Had a full tank of fuel, getting fuel, just won't run. I can get it started for a minute, but it sounds like its running on one cylinder. I put a spark tester on it, has spark on both cylinders while running.