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Air in the gas from overfilling? That is a new one on me!
As well as sensors and tune codes, check the CO setting. Maybe it is set up wrong at sea level and gets worse at altitude. If the dealer thinks air gets in the fuel from filling your tank too far, then who knows what else he would do. Aside from that, the only other thing I can think of is a clogged fuel filter, but I don't know why it would cause a problem at the exact same place on two different days.
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