Tuned a 2018 Tundra (supercharged) and cruise control is surging. Remote tune for someone, so I can't test things myself. He starts in 6th gear torque converter locked, engages cruise, converter unlocks and instantly goes to 4th and eventually settles in 4th unlocked.
I have read of other cases of this (tuned and then surging) but no conclusions as to what specifically caused it let alone how to fix it. Any insights?
Capture.JPG