Last week I swapped out the stock air box for a cold air intake on my 2013 Jetta 2.0, and 3-4 days later my engine light came on, went off and now it's on again. I just bought the car in October of last year and thats the only thing I've done to it and can't seem to figure out why it came on. I scanned it and all it said was that I was misfiring on all 4 cylinders, which isn't right because I would definitely feel and hear that if it was the case. So right now I'm just stuck. Wondering if any of you guys had the same problem/knew where to look and what to do to try and go around it and/or fix it.