My Renault Master year 2002 also keeps cutting out. After many tests I am going to have the ECU unitit sent down to Bristol to be repaired at the cost of £160.00 for the repair (so I am told) it is a quick turn around, (3 days) and I am hoping this will end my problems that have gone on for months. It's worth a try when nothing else has worked including a re-wire.
Steve.M., November 2012