GTR Running troubles

[wattsygtr]

Please can anyone help? I own a 97 Skyline GTR that is running on 5 cylinders most of the time. I have taken the car to Nissan and they have replaced the plugs and number two cylinder coil pack, and the problem is still there. Nissan can’t find the problem and they can’t find anyone that will look at the car either. I think it has something to do with the electronics but not sure. It runs like crap nearly all the time now, but if I put it under a little boost while its cold it runs normal till it warms up then runs crap again. If anyone has any ideas on how to help it would be greatly appreciated. Cheers

[Ronin 09]

Rotate the *new* coil pack and see if the missing cylinder moves. If it does they've replaced the wrong one.

Alternatively pull the plugs and see which is fouled.

Could be any number of things - plugs incorrectly gapped, igniter (if R33 have them vs R34 with built in igniter into coil), dodgy coil-to-igniter loom...