Well now that sounds a whole bunch easier... So much for the Buick service manual... LOLSteve Wood:
No, don't do that..use your scanmaster..it works much better. Just unscrew the iac adjustment screw about a 1/2 turn at a time and stop/restart the engine to reset the iac...after each restart, check the iacs and continue until they are 15-25.
Be sure the engine is fully warmed up, in park, and the ac is off.