Originally Posted by Ray_Lawns
I had the exact same problem in an old Bronco II I had. There was a vacuum modulator on the transmission that went bad. Super easy fix if you have one on yours which I am unsure of. You may also have a bank of three modules I believe on the passenger side back where the cab rests at and if one of those lines is off it will do the same thing.
I think that set up is electronic, and doesnt have a modulator. Its possibe if it has a throttle cable its buinding, I dont think those have throttle cables and it may bt the TPS sensor. Those transmissions also have solenoid problems which is a real big deal.