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The 2003 Chevy Silverado comes with an idle air control valve, known as the IAC, attached to the engine's throttle body. This valve plays a crucial role in managing airflow for the fuel-injected engine by interacting with the computer, ensuring smooth idling. If the valve malfunctions, you might notice poor idling, the check engine light turning on, or unexpected engine stalling. In such cases, it will be essential to replace the faulty valve, with the part costing between $56 and $195. If you opt for professional assistance, expect to pay between $80 and $174 for labor fees on top of the part cost.
In a 2003 Chevy Silverado, you can find the idle air control valve on the primary intake system.