Passat TDI PD 130 judder / shudder

Occasionally my car judders violently when pulling away in 1st, occurs when the car first begins a journey, then its fine, no judder when pulling away from lights etc. Clutch works ok, could the clutch be contaminated or flywheel warped or something simple, please help.

There is a recall for PD injector pumps for this problem. That and hard starts and smoke... check your local dealer for recalls on your car..