erattic idle, TPS?

did you check the voltage of the tps

The only problems I have had with the TPS is actually when the car would stall out and not start unexpectedly. The code reader indicated the relevent number for a bad TPS in that case. A replacement TPS instantly fixed the problem. Check for codes in case it is that emissions sensor also attached to the throttle body which is another $30 item if it needs replacement.

You can fine tune the TPS by measuring the voltage and twisting it after elongating the screw holes and then making adustments to get your desired voltage if the unit is good, but it sounds like if the problem might be the idle air bypass thing on the throttle body. Remove it, clean it with gumout, and reinstall. Also clean all the oily carbon buildup on the throttle door. Also, sand off the carbon buildup on the interiot of the distributor cap, and pour a bottle of Redline fuel treatment in the next fill up and see if helps clean up things.

do you have a vac leak? stock-ish motor should have 15-20 inches at idle.
good luck.