Welcome to the forum!
This could be any number of things.
Just few things for you to check initially
Check that you’re not running too lean
After it cuts out on you, on a jump, check to see if air bubbles are in the pipe, especially at the carb end.
If there is. Check condition of pipeline and tank seals, if starting to split at the ends, cut back a 10mm or so.
Check that the idle screw is set correctly, this should hold the carb open about 2.5mm- 3mm, depending on your model, at least sufficiently for a good idle.
The linkage from servo to throttle should be set so that the idle screw is holing the carb open and not the servo/linkage. (This is the key element )
Example, If the idle screw is set too low, and it is the linkage or servo trim that has been adjusted to set a faster idle, then when the truck lands the vibration may allow the linkage to move back allowing the carb to close up to the idle set screw position, which if too low in the first place, engine will Stoll.
So it is important to correctly set the idle screw for the correct idle, and not the trim/linkage.
Nitro