Idle Speed Control (ISC) Motor
WARNING: This page is about a different car, the 1995 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
A malfunction in the ISC circuit will set a diagnostic trouble code. For testing procedures, see TESTS W/CODES - 4.9L article in this section. Also, see ISC minimum and maximum adjustment procedures in ADJUSTMENTS article in this section.