I think you got it. I am just wondering if it s something in the driveline and not the engine causing the stumble. I agree and have never had my auto on/off button ON. Not fully know ing the mechanics of the system, at some point it interferes or lets the trans disengage for fuel consumption. Just trying to push the conversation along a new line as a simple engine stumble should not be an issue to resolve by Porsche or guys who have had aftermarket tunes. It should show up if running a live scan while driving if it s engine related. If I had Porsche resources I think the issue some complain about could be resolved.Not 100% sure I get what you are asking.... but, I have my Auto On/Off (button) OFF 99.9999% of the time. I hate that function. I turn it off in my wife’s LR as well.
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I also wonder if it s in the transfer case that many are feeling the transition of the torque being split and adjusted and re adjusted etc... Just food for thought.