AE is just used to get you into PE (Power Enrichment). The AE TPS is for the quick stab of the throttle, That is too quick for the MAP sensor to pick up. Then the MAP AE comes in, then PE depending on where you have it set at. The AFR value you asked about is for PE. Most like to say that AE is like a carbs pump shot, and that PE is like the secondaries opening on a 4 bbl carburetor.