When the dealer went to reprogram the ECU as part of the "sulfur smell" TSB, they foud that they couldn't program it. They realized the part number was for a Tundra which was why it wouldn't take the Sequoia program (so I'm told).
Had they not done that TSB, my guess is that I may have never known there was the wrong ECU, and I would have kept just been told that things like power roll-off and rough idling were "normal."
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