You don't just start turning the screw and hope for the best. Locate the TPS sensor. Adjust the sensor to .48v. Once that is done disconnect the gray harness that is attached to the TPS and start the car. Get the car to full operating temp and turn the headlights on. Adjust the idle to 800 +- 50 rpm by turning the idle air screw on the IAA unit. That's what Grimm is pointing out in the picture. Once the idle is set and stable re-attach the gray lead (WHILE the car is still idling) on the TPS and let the car idle for at least one minute. That should be it if you have no faulty components