we just got the R34 GTT and on inspection before buying it had a slight miss which she then took it away and put some fresh set of plugs in (unknown brand or gap). the mechanic who did the work for her said plug no.4 was rich and had carbon deposits... all 6 wer supposively replaced.
it was better but could still feel a slight miss up high. it gradually got worst till today driving around it wouldnt rev over 4500rpm.. just occasionally. and another time u can hear it miss on idle and at 3000rpm onto the highway. (it used to rev through fine without load. but when loaded it will miss now it misses all the time..?)
now im guessing its to do with the plugs.. wrong gap. bad plugs..
coil packs. i understand coil packs do this often.
AFM or sensor. (O2 sensor)
Fuel related (blocked filter)
any other suggestions wher i should go hunting..?
thanks for all ur help in advanced.
car is tiptronic '99 model with <50,000kms and cat back exhast and pod. (is my brothers car and he likes the pod and noise. personally i think the airbox is adequate)
thanks
mark.