So today I am driving home from work and it is about 15*F outside and has been snowing about 1"/hr. I am just driving along about 45mph in 5th gear and my car starts to randomly hiccup. Nothing I do can recreate the problem, it just randomly happens. I don't know what it could be. Is this something to do with the DBW when it gets cold (because I drove to work and had no problems at all), bad gas, or could it possibly be the tune?