What I do is after the car is running at normal operating temps in park with A/C off I turn the adjustment screw on the upper left side of the plenum.On stock set ups about 1-1 1/2 threads of the adjustment screw will emerge thru on the lever side of the throttle body,this is a good starting point.I then verify that the TPS is around .42-.44 at idle and 4.4-4.6 at WOT with key on motor off. Turning the adjustment srew clock wise will lowers IAC #,counter clock wise will raises IAC #.Turn it a little at a time then shut down the car and restart car to reset IAC.I normally look for 10-20 when the car is in park,engine fully warmed up,and the A/C is off.After you achieve this the you must readjust your TPS to .42-.44 at idle and 4.4-4.6 at WOT with key on motor off.To adjust TPS simply loosen both screws on the TPS and pull the sensor toward the front of the car,rotate the sensor clock wise or counter clock wise to adjust.Have someone mash the accelerator to the floor with "key on engine off" and when you achieve 4.4-4.6 tighten bottom bolt on the TPS sensor,then release accelerator and rotate sensor till you achieve .42-.44 then tighten top bolt on TPS sensor.Then after both bolts are tight verify that both idle and WOT TPS readings are within range.Good luck,ikle.
