My mech. said it was the coils and wanted me to replace them all ($1400). I was able to hear a "snapping" sound as well. But I'm happy for right now because getting the car back from the dealer they left my fog lights on and my car completely died. When I got it jumped, the problem went away. I guess the computer reset and it runs better for now.

So if you don't have the money right now, try disconnecting the battery.