Recently bought an 03 F250 7.3 165k miles. bone stock. Upgraded the turbo, ebpv delete, 4 inch exhaust, and a PHP Hydra tuner. Has the VDH4 PCM. It was obvious there was a tuner installed on this previously. before the upgrades i was getting random trans issues (sticking in gears mostly.) mostly intermittent. after installing the truck wouldnt fire up. crank no start. removed the tuner, it fired right up. re installed it and it was fine. pulling out of the driveway it shut down, and hasnt run since. im getting no fuel pump, and my scanner wont register. but im getting glow plugs still. im feeling its a pcm. any guidance? diesel tech friend seems to think the pcm was on its way out from the prior shifting issues.