This Handle approach reqires that all four throttles be wholly shut when to the stops. The throttle by-move screws are manufacturing facility adjusted and set to balance the throttles. The point that your AFR's are standard even though driving says that the ECU is more than likely Functioning Alright. BTW, https://blacktop4ageforsale82581.angelinsblog.com/31510187/5-essential-elements-for-4a-ge-engine-for-sale