Well today i got to and managed to change the plugs back to my iridiums from the coppers i had in there gapped down to 0.8, and now that the iridiums have been sandblasted and cleaned by me at work, there like new again, and work great. rev's all the way through the rev range now without hesitation, cheers guys, i had a feeling it might have somehting to do with the copper plugs. but seriously they were only in for 3000km and the gaps must have increased or something, i thought they woudl have atleast lasted the 5000km but turns out they didnt, but they plugs werent that dirty either.