Not sure if this is called “sputtering” or something else. But essentially today all of the sudden my car would sort of jump ahead, as if I when revving it back and fourth on the pedal aggressively. Not sure what could have caused this. Today was an essentially cold day so that may have something to do with it. Also my car overheats so I have to put anti-freeze in it most days. For the last few days I’ve been just using plain water, could this be the culprit? Please CarTalk community I need help. Why is my car jerking around like this?