I have a 2000 r6 and i noticed the other night when riding that it is sputtering and missing/backfiring between 6-8k rpms below 5k prms it runs fine and idles like normal. what do you guys think it might be? a dirty carb or bad spark plug or coil? or something different. luckily i just fixed my gto so the bike has been driven 5 miles like this just to get it home.