Could it be the fuel cut out switch, mine petered out a few weeks ago, the AA took it to my supplying dealer, he in turn rang me the next day and asked if i had been over a pothole or across a rough track as the fuel cut out switch had been triggered, i assured him i had'nt done either, but he was convinced that was the problem, as i was going on holiday that day i arranged for my son o collect it the next day, he duly collected it and 2 miles later it broke down in exactly the same way, the dealer collected it and this time they fitted a new fuel cut out switch and i am pleased to say no further problems so far.