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Is it shutting down at pretty much the same time? have you tried letting it just idle for about the same time to see if it only happens under load.
Sounds like an alt not charging but you did replace it you said. I would still check the voltage at the alt to make sure you have proper charging volts.
Clean all your grounds and load test your battery even if its new. I've bought 3 brand new batteries before that were bad from the start.
I would get a fuel pressure gauge and monitor your fuel pressure as you drive and as it dies.
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