There is a stepper motor within the throttle body that when you start the car, the motor fully opens/closes the throttle plate to see the limits that the throttle plate can travel. When you're off the throttle, (idling) the plate isn't fully closed otherwise the engine would shut off (lean out). I haven't looked at the throttle plate but some manufacturers drill a small bore hole so that the plate can fully shut but air can enter through that hole to enable idling. If you keep going through throttle bodies and the same code appears, I don't think it's mechanical issue, more along the lines of an electrical, either wiring back to ECM or tuning parameters. Just a thought, not bashing anyone.