Good to hear that the fuel filter looks to be the problem. I had a citroen xsara 2.0hdi witch was realy sensitive about condens/water in the filter. It would shake on trottle. And in the worst case i shook so hard it flipped out of gear. I cleaned the filter housing and drained the filter for a couple of hours. It was good then. Mayby check how much water there is in your tank.
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