Check the listing for details. 1984-1993 Idle Air Control Test Tool. Condition: New. Listed at 31.95 USD. 1984-1993 Idle Air Control Test Tool 601088If your Corvette does not idle properly, the IAC (Idle Air Control) valve may be defective. Now, you can test this valve with our Corvette IAC Test Tool. Allows you to measure the ECM current signal with your digital voltmeter. Quickly tells you if the IAC valve is functioning properly.Diagnoses 1985-1993 CorvetteSmooths IdleInstructions included Click here for more C4 Car Care & Garage! Visit Mid America Motorworks eBay store for Corvettes! We offer over 9,500 Restoration Parts, Performance Upgrades and Personal Accessories for 1953-2023 Corvettes and Corvette Owners. FREE SHIPPING within 48 STATES. If shipping to: Alaska, Hawaii or Puerto Rico please email our eBay Store for a shipping quote. For shipping outside the US please use the eBay Global Shipping program. Thanks for looking!