My 2005 renault master 3.0 diesel is having trouble getting going particularly in cold weather. It fires up fine very quickly after turning the key, but then the engine cuts out/judders to a halt seconds later. If done several times it lasts a bit longer but there is no response from the accelerator until the engine remains running for a good ten seconds or more. However the colder the weather the shorter the time it runs for before cutting out. I have had a mechanic look at it who is sure the problem is to do with the ecu rather than a mechanical fault but a diagnostic test showed no faults.