That's not the correct way to set your idle, either. I think what Chris was trying to get at is that the idle is controlled by the computer and there is no way to really change it. When you adjust your idle by just turning that screw you are defeating the purpose of having an idle air bypass. The procedure for resetting the computer is correct.
On an 89, you set the idle screw by loosening the idle screw until you can fit a .010" feeler gauge between the stop plate and the end of the screw. Tighten the screw until the feeler gauge comes out with some resistance. Tighten the idle screw 1 1/2 turns more. Check your TPS to make sure it is about .95-.98V. If it checks out, reset the computer.
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