ISC Valve
WARNING: This page is about a different car, the 1994 Mazda B3000 and 1994 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect ISC valve electrical connector. Connect ohmmeter to ISC valve 2-wire connector. Measure resistance. See IDLE SPEED CONTROL (ISC) SOLENOID . If resistance is not within specification, replace ISC valve.