07 audi 1.9 tdi

[sue1501]

HELP my audi keeps cutting out a few months ago my partner put a small amount of petrol in by mistake he didn't start it n got it towed to a garage where they drained the tank n replaced the filter since then it has kept cutting out nothing is showing up on the diagnostic machine the rac spray some easy start n it started any suggestions as last night it cut out on the fast lane of a duel carriage way