Hi i've got an audi a3 1.6 puney 8v. Its been a great vehicle till of late, when it suddenly started missfiring. I've had it plugged into vagcom and it comes up with random cylinder missfire and multiple cylinder missfire. The car hardlt had any power no i just experiance severe juddering say from 0 to 3000 revs Its also got lambda sensor open circuit showing as well!! Its also started to trigger the traction control light? when i switch the vehicle off the light resets itself I've changed the coil pack, and egr valve however still no joy any suggestions would really be appreciated.