As suggested in your other post. Start with a scan of the Engine ECM.
Could be an Injector problem or a mechanical problem (camshaft lobe or hydraulic lifter).
You will be better off going to a VW Garage than trying to solve this yourself.
Diesel engines are more complex to repair / diagnose than Gasoline engines.
Thomas
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Monday, December 31st, 2012 AT 10:40 PM