Golf GTI MK5 Idle Problem

[P1Tan]

Anyone had experience with their mk5 Gti dsg idling quite rough, almost as its vibrating.
Along with that when car is in Park it revs up and down from 800-12/300rpm continuouesly

Any advice would be appreciated!

[bigvanfan]

Could be the venting valve at fault , I believe Vw brought out an upgrade for this