I had this exact problem on my Aveo, it was the O2 sensor but for some reason it just randomly went away a few months ago and hasn't come back yet. The thing the dealer told me was it could have been the fuel pump or injector itself, where it's such a new car, low KMs and only 1-2 second bursts I can't really say much mine were maybe 5-10 second bursts.

Anyway, drive it into your local GM, the one you purchased it from if possible and have them look at it. It's most likely something minor, but could be anything and without lights and whatnot now backyard mechanics will either not find the problem, say it's something else, or not bother. GM won't screw you around too much.