How do you adjust the idle control on 1999 infiniti qx4?

To adjust the idle control on a 1999 Infiniti QX4, start by ensuring the engine is at operating temperature. Then, locate the idle air control valve (IACV) on the throttle body. You may need to clean it first to ensure proper function, and if adjustment is necessary, use a screwdriver to turn the adjustment screw to increase or decrease the idle speed as needed. Always check the idle RPM with a diagnostic tool to ensure it's within the manufacturer's specifications after making adjustments.