I have 2001 a4 avant, I pulled out in front of a car and hit the gas, put it in second and felt a kick. Then the car stumbled and sputtered. When I opened the hood. The cat area was glowing red I had only been in the car for 3 minutes. The codes came up #2 and #4 cylinders are misfiring. Another code said it had clogged or blocked airways. I put in the shop for the ignition coil recall, any other suggestions are really helpful.