Not electrical, more fuel filter. On the X Trail the filter is bolted to the A frame bulkhead and it gets very cold and damp in that position. From experience supermarket fuels are the worst offender for blocking the filter on an X Trail, symptoms are juddering under load and bunny hopping when really bad. Ironically, tick over will be usually ok but wil start to play up once a load goes on. Once the temp really goes down the fiter just freezes up.
Personally, I'd get a new filter installed and then put a couple of tanks of decent fuel through. If after this it's still a case of juddering then you are looking at the two fuel suction valves for replacement which are a know issue on the X Trail engine.
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