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The idle air control valve of the 2003 GMC Envoy can be found in the engine and connects to the HVAC system, directing air into the car's cabin. Its purpose is to regulate the airflow into the engine, thereby managing combustion and power output. If this system malfunctions, you may experience poor acceleration, as well as shaking and stalling of the car at a standstill. Driving in this condition can potentially harm your engine, so it is advisable to have it repaired promptly, which typically costs around $300, making it a reasonable repair expense.
The idle air control valve for the 2003 GMC Envoy can be found positioned on the top of the engine, specifically on the intake manifold.