How do you set idle on a 1992 jaguar xjs?

To set the idle on a 1992 Jaguar XJS, first ensure the engine is warmed up to operating temperature. Then, locate the idle adjustment screw on the throttle body; it may be covered by a plastic cap. Use a screwdriver to turn the screw to increase or decrease idle speed until it reaches the desired RPM, typically around 600-800 RPM for the V12 engine. Finally, check the idle again after adjustments to ensure it remains steady.