One of my friends has a '95 GS with Hahn St.2. He is misfiring terribly about 4.5k or 5k all the way to redline under WOT only. He has put new wires, plugs, O2 sensor, taken cat off, replaced intake man. gasket, fuel filter, new injectors, and fuel injector cleaner. Does anyone know what else it might be? He checked the codes, but it only gave him the pulsed air injection and IAC doesn't have enough voltage. Would the IAC cel have anything to do with it?? Any help is appreciated.