i bought a 96 forumula III last winter and i had an ongoing problem with it all winter. The first time i took it out i drove about 10 miles and it got really doggy, i looked at the plugs and they looked alright, but there wasnt any spark. I put new ones in and they worked fine, for about 10 miles. What is going on here, i had the carbs cleaned the first time this happened, thinking that was the problem, but it didnt work, i also cleaned the RAVE valves, no luck. Also, when all 3 cylinders were firing, i only had a top speed of about 70 and got probably 100 miles to the tank of gas. whats wrong with my sled? i dont want this year to be like last year where i always had to stop and swap out plugs every 10 miles. the last time i went out i went through 9 plugs.