last night at 135mph my focus rs started to stutter. after that i was taking it easy but when cuming on boost the car would holdback and misfire so today i checked my plugs. all plugs were fine but cylinder no.3 please see pics!!!!!!!!!!!!! whats doin this? just been mapped 320hp @ 17psi. these plugs were an uprated part that were fitted to cope with the extra power. can any1 help?