it sounds like your TPS isn't set correctly. it needs to be set between .990 and .999 volts. assuming u have a volt meter, stick a needle in the green and black wire of the TPS. hook the positive wire from the volt meter to the green wire of the TPS and the black to the black wire. using the 2 srcews on to of the TPS adjust it till u get desired voltage. if that doesn't work check for a vacum leak. hope u find something, good luck!
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89 GT AOD w/ shift kit, B&M rachet shifter, Trickflow intake, Crane (E-type) cam, 70Tb, 75MAF, 1.6 Rockers, Pulleys, MAC headers and H-pipe, Dynomax mufflers, K&N, 3 core radiator, white face gauges, custom interior, cobra R rims
MY89GT