Hi everyone, im new here and in need of some help. I have a 1990 R32 GTR, which has a misfire. It only happens when the engine has been driven for half an hour or more and from about 2500rpm to 3500rpm. I have tried various different things such as spark plugs, coils, ecu and AFM's. I have a feeling it might be something to do with fueling, such as fuel pump as it gets worse when there is little fuel in the tank. Does any one have any idea's, or suffered the same prob?