How do you adjust the idle speed control on a 1985 Ford escort?

To adjust the idle speed control on a 1985 Ford Escort, locate the idle speed adjustment screw on the throttle body. Start the engine and let it warm up to normal operating temperature. Use a tachometer to measure the idle RPM, then turn the adjustment screw to increase or decrease the idle speed as needed, ensuring it falls within the manufacturer's specified range. Finally, recheck the RPM after adjustments and ensure that the engine runs smoothly.