I have an A2 1.4Tdi 90 which has developed a 'juddering' when accelerating. It is most noticeable when accelerating between 50-60 mph. When I disengage the clutch and keep the revs up there is no juddering. There is also an occasional knock under the car which is intermittent - more noticable at lower speeds, forward and reverse. The car was serviced at a local Audi dealer (55,000 miles variable service - at a jaw dropping £121 hour labour. I am reluctant to return to the dealer in fear of a further 'rip-off' - anyone any ideas before I do seek there advice....