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The Idle Air Control (IAC) valve regulates the amount of air entering the engine when the throttle is closed, ensuring a stable and consistent idle speed. A malfunctioning IAC valve can lead to erratic idle speeds, engine stalling, and poor engine performance. Regularly inspect the IAC valve for signs of wear, clogging, or damage, and clean or replace it as needed according to your vehicle’s maintenance schedule, typically every 60,000 to 100,000 miles. Maintaining a healthy IAC valve ensures smooth idling, enhances engine performance, and prevents issues related to unstable idle speeds.