The truck was donated to me. The previous owner apparently had the transmission serviced alright.
The 3rd, 4th and gears have no problems at all, I can't even notice shifting, so smooth it shifts. The engine runs strong for the l4 and gas mileage is at least 20 mpg.
My guesses were the throttle position sensor low voltage, the 1-2 solenoid, or the vaccum modulator. A couple friends suggested the kickback cable, but I do not think that vehicle has one, but a solenoid.
The accumulator is a better suggestion, thanks. I'll service it tomorrow and come by.