Rough start then dies when warm

Got a 6.4 that starts and drives fine. No codes. Once shut off warm if you try to restart it it fires up and runs very rough for a few seconds then dies. Restarts fine if you let it cool down. Truck is ******d and tuned. Otherwise stock.

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Is there coolant in the secondary system, is the pump for it running, and is there flow? Sounds kinda like hot ass fuel to me. Also check frp voltage koeo, seen a bunch of those sensors go bad.and theyll sometimes only act up hot. Had to drive one third gear foot to the floor on the highway for a while to get it to act up. Never stalled but bucked like mfer.

I think it's frp sensor. Reading 1.1v koeo

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Crank sensor or cam position sensor?

Got it. Swapped out frp sensor and harness. Thanks for the suggestions.

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