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As I have been looking around the owner's / workshop manual lately, I did come across the part that mentioned rough running after installing a new battery, ( mainly for petrol models I would have thought ) and the advice is to get the car started and up to temperature, and then let it idle for ten minutes, switch off, and re-start, and the ECU would have re-learned the fueling requirements, and should run as well as before. That's fine, but I can imagine the throttle blipping antics required to keep a rough running engine going for ten minutes. When we had similar problems with our petrol Spacestar, it turned out to be an oxygen ( lambda ) sensor gone west.
Probably way too late for you guys, but might help someone else in future.
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