Feck knows!
Doing 70 mph down the A3 and it started to shudder, a few hundreds yards later it started to lose power. It then picked up again and was fine for the next mile or so. It then started to shudder, lose power again only that time it stopped! MIL came on. Couldn't see any smoke and turnover was strong, temp was normal.
If I hadn't filled up 50 miles before I would have said I'd ran out of diesel. I've also hit a dear while in an audi S3, that damaged the air flow sensor which gave the same symptoms as last night. I called the RAC who ran some type of diagnostic, they came back with .....Fault not found!!!
Cheers
Stewart