I had this problem initially. It was cured by adjusting the TPS sensor to between 0.995-0.999 volts.
TFS Twisted Wedge O-ringed Heads (Fox Lake CNC Stage I Port), FRPP Cobra
Intake (Lower Port Matched to heads), Lunati #51014 Cam, Pro-M 80 MM MAF, FRPP 65 mm TB, Adjustable Fuel Reg, 190 LPH Fuel Pump, 1.6 Bolt Down Roller
Rockers, 6.7" chrome-moly push rods, TFS Guide Plates, FRPP Roller
Lifters, FRPP Double Roller Timing Chain, FRPP Polished Cobra Valve
Cover Kit, TFS Plenum Spacer, FRPP 24 lb Fuel Injectors, Graphite Head
Gaskets, FRPP 3.55 Ring and Pinion, MAC Long Tube Headers, MAC Hi-flow H-PIPE
w/cats, Flowmaster "Force II" Catback system, MAC Underdrive Pulleys,
MAC Subframes, K+N Filter, 180 thermostat and FRPP 9 mm ignition wires
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'93 GT Conv.
13.35 @ 104.8 mph
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