Vibration when accelerating?

[audi1664]

Alright guys, just brought a 98 a4 avant 2.8 quattro absolutly love the ol girl no issues whatsoever aprt from..........When i accelerate softly or hard the back end\middle of the car judders im thinking it may be a propshaft dohnut but dont honestly know has any1 here had the same problem?

Any help appriciated!

regards dan