Not sure which injection system is fitted to my old Volvo, but last year it ran very rough then finally stopped. The AA man diagnosed overfuelling (like yours) and a Volvo garage found a temperature sensor wasn't functioning - it was stuck on "full choke". They also suggested disconnecting the cold-start, like above, if it happened again, which is worth remembering as I haven't run the car for ages so it might be reluctant.....
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