How do you adjust the idle on a 1992 Buick Regal GS?

To adjust the idle on a 1992 Buick Regal GS, first locate the idle air control (IAC) valve, typically found on the throttle body. Start the engine and allow it to warm up to normal operating temperature. Then, adjust the idle speed by turning the IAC valve's adjustment screw while monitoring the engine's RPM; aim for the manufacturer's specified idle speed, usually around 600-800 RPM in gear. Always double-check your adjustment by letting the engine idle and ensuring it runs smoothly.