How do you adjust the idle speed on a 1999 jaguar xj8?

To adjust the idle speed on a 1999 Jaguar XJ8, first ensure the engine is at normal operating temperature. Then, locate the throttle body and adjust the idle speed screw if equipped; however, many modern vehicles, including the XJ8, manage idle speed electronically through the Engine Control Unit (ECU). If you suspect an idle issue, it's best to check for any error codes using an OBD-II scanner, as adjustments may be needed in the ECU settings or due to underlying mechanical issues. Always consult the vehicle's service manual for specific procedures and specifications.