I'm going to provide as much info as possible, please be patient. Boat was running great came home flushed motor. Week later changed plugs ( gaped to .030 ) changed fuel water separator. All because had been a year since done. Month latter peeped boat to take out while idling on the muffs I noticed a random skip. Took boat out figured just needed running well it wouldn't run above 5100 rpm. It would shake and cough and misfire. Back off throttle all good. I went back to the old spark plugs, mixed a portable gas tank with fresh gas/oil and even swapped the power pack with a known good one. I unplugged the rectifier per the CDI troubleshooting guide, and finally after all that I noticed a carb leaking around bowl. Thought I had it. Rebuilt card today still no change. One OMC mechanic said get rid of the champion plugs and go NGK another says stay champion. I just want to fix my motor. Guy's I need your help. Thanks