Hi Karl et al, I have an 05 1.9tdi Golf with the same problem! It began if I drove in heavy rain a year or so back and so WD40 all over connectors under the bonnet and a short break (by the roadside sometimes!) seemed to do the trick. Since the cold weather has gone away after Christmas it is much worse! I've just had it recovered to VW Main Agents but it started fine to go onto the recovery truck. My Glow Plug warning light comes on if the symptoms are bad, but not allways. It fells like no fuel for a milli-second then all fine for a few seconds, then repeats. If I stop at a junction it cuts out but will usually start again, albeit reluctantly. Its driving me mad so hopefully Robinsons VW can find the fault - loose connector somewhere in the fuels system is my bet........?