Proflow Idle Air Control (IAC) Valve, Steel, Natural, For GM LS - PFEQTBIACPart Number: PFEQTBIAC Proflow's GM idle air control valves control your engines idle speed. They are a GM recommended replacement part for your vehicle's original component. These electronically actuated valves regulate the amount of air that bypasses the closed throttle plate while at idle. These idle air control valves have been manufactured to provide you with the same performance, durability, and service life you have come to expect from Proflow.