ISC Valve
WARNING: This page is about a different car, the 1994 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect ISC valve electrical connector. Connect ohmmeter to Idle Speed Control (ISC) valve 2-wire connector. Measure resistance. Resistance should be 11-13 ohms at 68°F (20°C). If resistance is not within specification, replace ISC valve.