Hey @Ivan Pironi so f150 has 3 types of traction control, I’ll post a chart explains the 3 types of traction control.
1 press the button and it turns off traction control.
2 hold for 5 seconds turns off ESC
3 hold for 5 seconds while in 4L turns off RSC
Now for the engine cutting power is mostly because if you drive on D the car automatically upshifts so you don’t overhead your gearbox, then will again downshift if you are still pressing the gas pedal. (Now you have to make sure you actually pressed the traction control button until you get a message saying ESC disabled. If it says traction control disabled it means it’s not fully disabled)
To over come this simply drop your gear into 1st and stay there, since it’s a big car and the higher you want to climb the more difficult it is it will be on the car, unless you have enough momentum before the dune to glide upwards. Further more if you are in sport mode it helps keep the gears lowers if you aren’t bothered driving manual.
The f150 owners manual doesn’t say anything about traction control or anything on how to remove it. You can install a kill switch in your car but your warranty will void. However I've never had the problem of losing power (only when I’m in D and doing long climbs or long side slopes. I use my tiptronic when I want to do long climbs and long slopes.) I thought about wanting to add a kill switch but after doing some research I found that I don’t need to. Loss of power isn’t a problem of mine anymore. (Unless I mess up and get lazy and not use my tiptronic 😂)
Hope that helped. If we meet up one day on a drive I’ll explain face to face!
Have a great day!
P.S.
If you turn off your car and turn it back on check that traction control is off. Your problem might have also been that your car was off and you switched it off and forgot to check if traction control was off, happened to me 😂