Efi 3.9v8 help keeps stopping

Hi looking to see if anyone can help. I have a landrover with rangy 3.9 efi v8, Mallory coil dizy and module, it runs on lpg and petrol. The fault is same on either fuel. I have swopped the coil over with a known good one and fault persists. The fault... The engine runs for about 8 miles or after 10 mins tick over and then cuts out... No spark after two hours it restarts. When it fails I have removed fuel rail and temp sensor wires and it still does not run. Has anyone any idea what the fault is?

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