ok i replaced the plugs, all 6 with ngk iridium 1-step colder, part 3330..... and it ran amazing all the way to redline. after about 3 full pulls from 1,2, and 3 all the way to redline, after the three pulls it began to sputter. so i went home pulled #1 spark plug and this is what it looks like....i know the pics are big but i want you to be able to see them. the second pic kindof sucks but you can get the point