Hey guys, I have a 2.0 tdi 140bh and when it's idling it seems to be very lumpy and judders but then when I give it some revs it goes away. I had it serviced today and the fuel filter was filthy! So we cleaned the cylinder up so all the dirt/grime was gone and changed the filter and it's still the same. What could be causing this juddering? Any advise would be great! Thanks!