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no matter what, your truck should idle at 750 whether in gear or park, that's the first issue to address, my sct tuner has the app, to adjust idle. if you cant do this, go back to the dealer and spend the 100.00 to reprogram your pcm, I bet all your problems will go away
I think superchips removes the factory tune and flashes theirs right? Back when I did the superchips tune, idle was the same as stock, so I don't know.