I have NGK Plugs in it gapped at 32..... I thought it was the oil seal in the VC causing the stuttering but I fixed that and it's still stuttering... right around 5000-5500... once I go past that it hits its powerband again and pulls like hell... I'm thinking about replacing all the plugs... and hopefully that'll fix it.... I'm trying the easy/small stuff first... Any other ideas? :help2: It's not the gas.. I'm running our premium (90 octane ) with quite a bit of torco which should equate out to about 95 octane.