The car is a 2000 Frontera Sport RS Dti, with the 2.2 diesel engine.
It has taken to momentarily cutting out swinging in and out of a roundabout. It also faulters at the higher end and is prone to momentarily cutting out at other times, often accompanied by the EM light, which then goes out and it starts to recover.
I have checked for air leaks, cleaned the fuel line water trap and a dirty air cleaner.
If there is an inline fuel filter I have not found it yet.
Any ideas would be appreciated.