Anyone have a pic of the inside top of a 6.2 injection pump?

[Mogman]

.. after over 50 miles it started acting up again.

Started up fine, idled for 15 minutes to warm up.. got about four blocks down the road and got chuggy then died. Cranked like it was outta fuel, I stomped on the pedal a few times and it restarted, got about a block and it happened again. Repeated this process till I made it home. I pulled the fuel return check valve out and drilled it out so it’s open all the time just in case it was that front solenoid that was giving me issues.. same situation.

Looks like a new (rebuilt) pump is in my future.

That does not sound like a typical IP issue, more like a plugged return or fuel starvation.(although I am not always right!)
Did you pop the fuel cap off to see if it had built a vacuum?