Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1993 Pontiac Sunbird, 1993 Pontiac Grand Prix, 1993 Oldsmobile Cutlass Supreme, 1993 Chevrolet Lumina, and 1993 Chevrolet Corsica. However, it is still accessible from the selected car via links, so may be relevant.
A slow, unstable idle may be caused by a system problem which cannot be overcome by IAC. Scan counts will be greater than 60 if idle is too low and zero counts if idle is too high. If idle is too high, stop engine. Fully extend IAC with driver. Start engine. If idle speed is greater than 800 RPM, look for possible vacuum leaks.