I don't know if your car is petrol or diesel but I had a similar problems on my
previous V70 (petrol). A process of elimination indicated a faulty ignition coil,
they do seem to weaken with age..cost about £60. I would also check out the
injector and spark plug on the of the offending cylinder.
Could be completely wrong of course but it would worth identifying the cylinder and checking these items before digging any further
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