"The vehicle would have reverted to previous stored values in the ECM to enable to run properly."
I don't think so - I don't think there is any electronic open-loop control in the KE system. But, the effect is the same, since it is a fully operational mechanical injection system.
In this instance it sounds like the airflow meter was not the culprit, but something that attaches to it in the airflow path was temporarily sealing better, but has become loose again. The rubber in the idle control valve circuit (and everywhere else) hardens and becomes brittle with age. Leaks develop at connection points, or the rubber cracks. It is cheap to replace it all thru FastLane, but some of it may be hard to identify.