I have an A6 of 99 in the workshop with ZF 5HP-19 change. The problem is that by stepping on it is revolutionized and does not go. I have the vag-com and I don't get any error code in the gearbox. If someone had this problem and the solved would be very appreciated, I would spend information.
Did you check the transmission oil level? .. And if you have done it as you do with the engine running or stop? Have you made a filter change to the automatic box?