Mine was doing the same thing at 45k miles, I bought autolite app 764 plugs(ithink that was the number, you might do a search on plugs) and replaced the old ones...problem gone!
Try it and come down to the national meet! If you can't make it, remember that you can still enter the raffle to win great prizes!!!! Tickets are only $5 for the raffle. There is a post in the general forum about it.
