Hello, This is my first ever post and im not sure if im posting in the correct place so please be gentle . I brought a 2006 Audi A6Tdi 2.0 Sline Auto/Tip with 130k on the clock with full service history about a month ago. When i purchased it i remember noticing it misfiring when the guy started it but it was due for a service so thought it was related to that, however I have had it fully serviced at a independant reputable garage and the problem is still there. When starting the car from cold it has a slight misfire/shaking, you can see the rev clock needle slightly playing up and down but never going over 1000 revs. Once its warmed up after 5mins or so and i start driving its totally fine but sometimes at traffic lights it does the same (again only sometimes). Other than that it drives perfectly fine. I also notice at times its abit sloppy on take off but im not sure if this is normal as its my 1st Audi. I remember mentioning the above to the garage guy and he said it may be something to do with the injectors! Any ideas? All replies will be very much appreciated.