Hi. I have a 1997 Campion bowrider with a 3.0 Mercruiser engine. Last week wife and I took it out for first ride of the season and had no problems at all. Really ran nice. Took it out today and it ran rough right from the start. Didn't want to idle and shook...like it had a miss in it.Could the carb go out of adjustment that fast? still has gas from last October. I did put a new distributor cap last year. Cant figure out how it ran great one week, to terrible today. Any ideals would really be apreciated. could a bad coil make it run really rough? Thanks again.