How do you adjust the idle on a 1994 Toyota Celica?

To adjust the idle on a 1994 Toyota Celica, locate the idle adjustment screw on the throttle body. With the engine warmed up, turn the screw clockwise to increase the idle speed or counterclockwise to decrease it. Use a tachometer to monitor the engine RPM and aim for the manufacturer's specified idle speed, typically around 700-900 RPM. After adjustments, ensure the throttle responds smoothly and the idle is stable.