I dont remember if in 92 they had the power distrubution box right next to the battery, I thought they started that in 93. But check there, if there is one there, pop the cover off and check the relays, there should be one that says trans system I think it how it is labeled. If not the best thing I can think of would be to unplug the wires from the solenoid pack on the front of the transmission and see if it will idle in gear.