How do you adjust the idle on a 13B 1994 Mazda RX-7?

To adjust the idle on a 1994 Mazda RX-7 with a 13B engine, first ensure the engine is fully warmed up. Locate the idle adjustment screw on the throttle body, which typically requires a flathead screwdriver. Turn the screw clockwise to increase idle speed or counterclockwise to decrease it, while monitoring the tachometer to achieve the desired RPM, typically around 800-900 RPM. After adjustment, verify that the idle is stable and recheck if necessary.