OK, my 24K mile '14 EB has been doing this for a while. Lay into the throttle and you get a sulfur smell in the car about 30 seconds later. The first time it was BAD, like real bad. I thought there was some kind of leak or something in the area I was driving, but after noticing it a few more times when stepping on the gas I knew it was the car.
Car runs good otherwise except for an occasional mildly rough light load stumble, almost like a miss, but it goes away and stays away for quite a while before happening again.