I have an A4 1.9 TDI with the new low emission diesel engine. However, it misfires at around 2400 rpm - especially when I ease off the accelerator. It has been into the local Audi dealership and I was told this was a 'characteristic of the car'. If it was a 1973 VW Beetle that I purchased for 1k, I could well believe it. However, I do feel I am being told a pack of lies. Does anyone have similar experiences or advice on this?