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I removed the stock o2 sensor and unchecked the box in TuneECU. I am using the wideband o2 that came with the autotune.  From my experience with the auto tune, it seems slow to adjust and has a hard time with pressure base tunning. It also wont make adjustments its below 10.00 or above 15 afr.  I have had better luck data logging and manually adjusting it with the dynojet power core software. Now I understand why dyno operators charge so much, its very time consuming.