How do you adjust the curb idle for your 1984 mercury grand marquis?

To adjust the curb idle on a 1984 Mercury Grand Marquis, locate the idle speed adjustment screw on the throttle body. Start the engine and allow it to reach normal operating temperature. Use a tachometer to measure the RPM, then turn the idle speed adjustment screw clockwise to increase or counterclockwise to decrease the idle speed, aiming for the recommended RPM specified in the owner's manual. Finally, recheck the idle speed after adjustments to ensure it’s within the correct range.