how long have you owned the car? ever since the dieselgate fix these things kinda have random misfires of sorts tuned in per say. and if it happens to be a dsg equipped car they can have random hiccups aswell sometimes described as feeling like a misfire. mine does it periodically and while it always makes me feel like i should be concerned most will confirm it is "normal" i think they defuel under certain parameters in order to acheive the smog requirements. an in-tune driver also can typically feel the regen process begin and end.I have a random misfire in high rpm’s not sure the issue I’ve ran fuel cleaner and new fuel filter no codes it shut off on me while driving and the glow plug light started flashed for a minute.