thought I would post my findings.
This has been one of those faults I've been living with for around a year. I tried replacing the PCV valve but it made no difference. In the end I got a copy of VCDS and fault scanned.
It came up with this error
008213 - Intake Manifold Flap Position Sensor (Bank 1)
P2015 - 000 - Implausible Signal - Intermittent
The garage I used diagnosed the issue and in the end i replaced two parts
07L 907 386
037 906 283 C
car now runs spot on. Just thought I would share as I know the idle and jerking (cant help laugh when I write this word) issue seems common
Doesn't jerk when setting off.
Idles perfect too.