How do you adjust the engine idle for a GMC Safari Van 2000?

To adjust the engine idle on a 2000 GMC Safari Van, first ensure the engine is at operating temperature. Then, locate the idle air control (IAC) valve, which is typically found on the throttle body. You can adjust the idle speed by turning the screw on the IAC valve or the throttle plate, but it's essential to consult the vehicle's service manual for specific instructions and specifications. Finally, clear any diagnostic trouble codes if necessary and test the idle to ensure it is stable.