There is no reason to stop the vehicle or engine when changing tunes so long as all of the calibrations "burned" to the Hydra are of the same calibration family.
It is not recommended to change them on acceleration or when doing something such as driving through an intersection, railroad crossing, or the drive through JUST IN CASE a stall occurs (rare).
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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