Your car is missfiring. No big problem. I had the same problem. 1st thing to do is check your spark plugs and change them if need be, that should fix it if not it could be your coil packs (not in many cases). Get your car on a dyno if its other things they can tell you from that. My problem ended up being that my Air Flow meter was maxed out only on 10psi so it can be a variety of thing. If you want to read more do a search for "missfiring" and read till you are content.