My motor was running great, then it felt like it went to four cylinders, then back to six. Then it wouldn't go over 10 miles p/h. Am I looking at a power pack?, Ethenol, dirty Carbs, blown cylinder? When it is in idle and I use the warm up level, it sounds normal. I did hear a little rattle. I use 89 octane and I use stabil. I don't think it is a compression issue. Any insight would be helpful. Thanks
