I've never heard of this problem.
there does seem to be a fair bit of info out there. This may be worth a read. TD5, Topside switch failed pre injection diagnoses help needed
If you have the old ecu it might be worth having a look at the capacitors.
There was a guy on the Landyzone forum that had the same problem diagnosed to a pinhole in the fuel line. Disco TD5 Starting perfect, but cutting out when reved | LandyZone - Land Rover Forum Apparently there was recall in the UK
LAND ROVER announced a problem with the Discovery Series , Diesel TD5 affecting a total of 33,491 vehicles.
Rear fuel line may chafe with ABS/ Water sensor, and fuel pump harnesses with the possibility that a fuel leak may develop Vehicles built from 06/30/2001 to 04/19/2004 are at risk.
The following remedial action is necessary to address this problem. Remove original convolute tubing and replace with smooth PVC tape. Additionally, change fuel line, and re-route the wiring harness to run to the side of the fuel lines.
Vehicles with the following identification numbers are affected:
SALLTGM981A736101 to SALLTGM834A865281
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