Hi

I recenetly purshcased a 2008 A4 2.7L with DSG gear box (60k). When accelerating and sometimes de-accelerating the revcounter/engine revs u. Its just like pushing the gas pedal down a bit then taking it off. The anoying thing is that it does not happen every time I drive off. I took it to a local garage and they replaced a sensor on the gear box. This did not work so I took it to and Audi garage they changed the gear box oil and fuel filter. Now £350 lighter but this has not fixed the issue. They checked the EMU for faults and updates but nothing came up. They should have road tested it but this did not happen. The car is a joy to drive when it is working okay. I cant afford to keep trying different things and wont sell the car with this issue. Does anyone have any ideas?

Many Thanks