So the service tech at my local dealership, warned me to”NOT” flash a truck unless it is absolutely necessary. His thought was just what you said…I have a 22 3500 drw wirh ho and aisin mine has been chugging up hills so I made an appointment they flashed my pcm and tcm for a tsb they have. made the truck worse and actually fells like it shutters worse sometimes it feels like trucka gunna stall froma start now. I did not ask them to flash the truck they decided to do it on there own so becareful what you bring yours in for.