Hi; I was told TPS should not need to be adjusted, but it has adjustments as far as screw down wholes and wondered if like on a Mustangi if there are adjustments to set TPS initially?

See Mustangi sample below:

Re: 1993 Setting TPS Correctly

Do you not have to a least set TPS as a starting point as follows, yes this is a Ford, but just an example hope it does not offend the Chevy Gods, :-):

1) Loosen the two screws holding on the TPS, (The screws can be very stubborn, so make sure you have a good quality screw driver that fits snug and has a long handle for lots of torque, or you might strip the heads) just enough to able to swivel the TPS with force.
2) Pierce the "GREEN" wire with the pin and hook the positive (+) lead from the voltmeter to it.
3) Ground the negative (-) lead from the voltmeter. Use a good ground, like the engine or other grounded metal source.
4) Turn your ignition key to the run position, but do not start the vehicle
5) Rotate the TPS until you achieve .98 to .99 Volts (For stock or slightly modified engines).
6) Tighten the screws on the TPS and recheck.

 

yes, the procedure is pretty similar, it should be at .54v with the throttle blades closed, and 4.0v or more at WOT.