...about this. I have not had a stock ECU in my car for years, and when i did i ran the Zemulator. Im just doing this from what i recall and my logic. (My o2`s was fine btw). As i remember even the conzulr told me it was in CL when ideling. And my logic tells me it should fluxate to feed the cats. (with oxygen). I will however connect my conzult to a car with stock ecu the next time i come find one. (there are far between them where i live).