i had a similar problem in april last year. Started and drove fine, when i slowed for a junction it cut out.
Sometimes it would start but i would have to keep the revs up or it would stall.

turned out to be the Fuel Pressure Regulator!!! try it, usually get onne on ebay for £4 or £40 rs breakers.

never had a problem after that. took 10 mins to swap over!!!