hey did ye have any luck with the missfire?

Ive just had this problem with mine and Shaun suggested plugs so i changed them even though they looked fine and its cured it:D

well i have similar problem, it starts to misfire under presure at 3000rpm
bu then all of a sudden it could go away for a second and then its back. it was running on denso plugs, so i changed them to the ngk gaped them and the problem got worse, ive checked for boost leaks as said, and i replaced all plug leads inc king lead. now this is the max power silvia so i dnt know whats done to the engine, the wireing is in a mess and ive replaced some of it. any ideas?

Problem solved :)..popped in a new set of BCPR7ES's gapped 0.9mm last night, turned the boost back up and the missfire/flatspot had gone away completely. Plugs looked nice biscuit brown colour and had only done 3k miles or so :confused: . Thanks for all help , probably saved me cost of a new fuel pump and intercooler :D