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The ECUs are pretty hardy, it would be the last thing I'd suspect.
Im not an Ljet person, but I have a 75 VW bug that is L-jet so I have a little exposure to them so my guess is...
Pull one plug wire and test for spark, especially after it dies.
Could be heat related? It seems to work ok until it gets up to temperature, or
It may be a fuel starvation item...which could be a defect in the air flow meter. Have you checked that out?
Maybe the resistor pack is failing under heat and opening up causing the injectors to stop. Take measurements of them cold and then immediately when it dies to check their value.
If you have an exhaust gas analyser (a shop will) you could monitor the mixture to see if its lean or rich, which might give a better clue as to where to look.
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