I have an 85 GSL-SE. It's got a full racing beat exhaust, venom injectors, cool air intake, no air pump or anti-backfire valve, taylor 8mm spiro-core ignition wires, accel super street coils. i replaced the tps and the by-pass valve, and had the alternator juiced to support the stereo. I have a bad hesitation now and a 3500-4000 rpm miss and fall-out. Its as if I lose all my spark at that rpm and only get it back every once in a while. I chaged the distributor with two new rebiulds and everything else is new. Anyone have any advice?