crawling

I've noticed this before, but I'd forgotten about it as it has to be quiet to hear it and I usually have my stereo on. When crawling along in first gear - sat in traffic, clutch foot right up, and just easing the accelerator to move along. As soon as I lift off the accelerator I get this...

Hi, Did a quick search and came up dry, apologies if this has been covered and I've missed it. Picked up my DSG TDi on Saturday and since then I've noticed that when it's crawling forward under its own devices when in traffic (no brake, no throttle) there's a slight juddering/vibration. It...