Why does it "buck" or "jerk" every once and a while around 30-40 mph & stall?

What is your question?

The stalling has only happened twice but the bucking/jerking happens a few times a week usually when acceleration but once or twice in cruise control

What makes this problem better or worse?

Pushing it up hill

How long has your 2013 Jeep Wrangler had this problem?

Off and on weekly