TPS adjustment is easy to do, but hard to explain. Your gonna need an accurate digital volt meter (one that will measure to at least one decimal point or 1/10th of a volt accurately) and maybe an old style ohm meter with the analoge (needle type) pointer, which is used for one test.
Half of the TPS (outside) is for the transmission control unit and the other half is for the egine controller.
Search TPS adjustment, there has been a few posts that explain it much better than I can.
If your 02 sensor is probably bad, it will pay for itself pretty quick in gas savings. I just changed mine and am saving about $3-4 a tank. MY 02 sensor will pay for itself, in like three months, of driving.
I recently had a TPS, where the connector contacts were oil coated, it was shifting into the same gear at different speeds, kind of erratically.
I had one TPS that had a hitch or dead spot in it, (in the motor controller half) which was at about 1/3rd throttle opening. If I accelrated quickly I wouldn´t even notice, if I accelrated slowly and/or was cruising at exactly the right speed, the motor would kind of loose some umph, kind of hestitate.