I can't really answer your questions because I don't know what's going on. The narrowbands are supposed to cycle in closed loop. That's how you know it's working. The range and length of the cycles isn't relevant. You should see around 14.7 AFR on your wideband when closed loop is functioning properly.
Reenabling that periphery bit will determine if the issue is something simple like your o2s being switched. No clue if you tested this or not.
If this isn't the case, you'll have to heed my advice about tuning the intake maps to get things back into spec.






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