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Pretty much has to be a stoppage of fuel or spark, doesn't it? If you have a tach, does it drop to zero as soon as the engine starts to fail?...or die down in synch? No tach? - put a timing light on a spark plug wire and watch it until the engine quits. If, as the engine dies, the light keeps flashing in synch with RPM, an ignition problem is unlikely.
Then it's fuel. Test again with a noid light on an injector, or a long screwdriver or such on an injector body while you press the other end (preferably the plastic handle!) to your ear and listen to the injector clicking. Same test - does it continue clicking in synch with engine RPM as the engine fades out? If not, suspect a bad ECU. A faint possibility is the main LH fuse on the left inner fender, but I bet you've checked? Easy to pull, clean contacts on fuse and holder and try again.
If the engine will pull a load within its 10-min run time, it sounds like fuel delivery by the pumps and filters is good. If the time-to-failure is relatively constant, it does sound like a heat related problem....something is expanding as things warm up and going open circuit. I can understand your frustration - tough problem!
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Bob (son's 81-244GL B21F/M46, dtr's 83-244DL B23F/M46, 94-944 B230FD; hobbycar 77 MGB, and a few old motorcycles)
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