[Interlocutionist]

I was driving today and as I was going downhill with my foot off the gas I was thinking about the pumping losses and EGR and the IAC that was probably open because the throttle was shut and I thought, "what about using the EGR instead of the IAC?"
Both the EGR and IAC bypass the throttle plate, so when coasting downhill or just decelerating, one or both of those valves have to be opened. So I was thinking, if the EGR was routed to the IAC input, or the IAC was disabled somehow and the closed-throttle airflow was all from EGR, what effect would this have and would there be any benefits or problems?