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this suggests a failing fuel pump or crank sensor
it could possibly be a power supply issue to the engine computer.
I would suggest checking for / monitoring fuel pressure and spark the next time it happens to narrow down further.
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you said this could be a failing fuel pump, i take it that this is the one that runs along the floor against the chassis leg? you also mentioned checking for spark its a diesel engine, and you dont think that its an injector problem like others have told me its injectors, but then others say its not as when i started it on a tow it ran really good and smooth not a hiccup from the engine.