I have but plugs were done at service when i gave it a good going over and my leads were at 80 odd thou, were the next obvious weak link and looked about ready for a swap!, If the Audi master tech says its ignition then it could well be ignition! If the misfire thing has only been happening since it had its plugs done or not long after it (you say you are at 42k and they were swapped at 40k) then the plugs or leads could have a fault/damage that went unnoticed at the time of the swap? Did it do it before the dec 09 service? Hope you find your gremlin....even if its a different one to mine
