[86GT]

I've had a similar problem, and it occurs low in the rpm range, part throttle only. I'm thinking a fuel pressure problem myself. Whats your pressure at? How's your fuel filter, maybe it needs changing. Just some ideas to try and help you out.

Have you pulled codes from your computer? Maybe that'll give you some more insight. At least for me it lead me to the fuel pressure thing, since I'm running lean according to my o2 sensors.