2011 4.8 Porsche Cayenne

[Goodman82]

I have just bought a 4.8 2011 Cayenne - it has full Porsche service history and drove perfect on the test drive) i bought private.

I have now noticed at low revs 1200-1800 it jolts in 2nd and 3rd gear - absolutely fine in all other gears and doesn't do it if I put my foot down and keep the revs up only when going at low speeds

Does anyone have any ideas i've read everything from tires to reprogramming all the way through to transfer box any help would be greatly appreciated.