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Oh it was dyno tuned... Tuner been racking is head trying to figure it out too
As far as I can tell its a glitch in the ECU... Has something to do with the "Memory" in the ECU...
I would honestly have GM flash it and then reflash the tune back in
I had that happen on a 2015 Z06 as well.
Did a write entire back to stock, then carefully made as few changes as possible to get the car functioning properly.
Mine might have been from converting to flex fuel. Ditched that idea.