The only way the TPS could really affect your idle is if it is reading above 1v. This would fool the computer into thinking you are at part throttle. You only need to make sure that voltage is at around .85v to .95v. The idea of getting it as close to 1v as you can to improve throttle response is just a myth that we really have to kill.
Use a digital meter as suggested. Neg probe goes to black wire and positive probe goes to green wire. Turn the ignition to the on position to check it. There is no need to start the car. Move the throttle lever slowly and make sure there are no skips in the voltage. If there are, replace the TPS. It should go from just below 1v to about 4.5 v. Release it slowly and make sure voltage is still below 1v. If it is above 1v, loosen the screw and wiggle it around until you get it solidly under 1v and then tighten the screws.
That's about it.
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