Another thing you may want to check is the Cam Angle Sensor. I am having the same issue on my 95 RB25DET and I just changed the CAS and the issue has seemed to go away. I still need to change the plugs and replace the MAF for other reasons as I just got the car. But if I were you I would take a look at the CAS. As mine would run perfect if I did not go more than half throttle or over .5 kpa boost. When I did it started missing like a fool. When I took it into the shop they said it could be either the coil packs, MAF, or CAS. Hope this helps.
