If your AC or your defroster is on, you will definitely get this uneven combustion as your compressor cycles on and off. I want to say I do notice it on our 2014+ as well when idling even when the AC or defroster are not "in play". Sometimes it "misses", but not usually too extremely. I usually chalk it up to imperfect combustion but I've rarely seen cars purr perfectly when idling as most will putt occasionally. I'd recommend posting some video w/audio when it happens.I have the 2.0L 2014 KIA Soul. When I stop at red lights, I notice when idling the car tends to "putt" from time to time. Is the timing belt off? I'm not sure what's going on. Maybe i should take it to the dealership to look at it.