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I saw the same thing about tapping the pedal to the beat of music... who does that?
I also read something about cold air being a factor.
Anyway, exhaust leak, vacuum leak, or bad sensor.
I would probably report this to the dealer without some of the details you mentioned like revving and installing the skip shift. If O2 sensor is bad they might say you damaged wiring installing the skip ship.
Ultimately you want this addressed under warranty because it will be very difficult to sell/trade or get inspected with a CEL, even one that comes and goes.
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