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The DPFE is brand new, if I’m not mistaken it was Walker. I’ll have to go back and check what the brands were for everything but here’s what’s off the top of my headdo you mind listing brands of the replacement parts used so far?
most threads have listed some type of grounding issue with ignition system components as a culprit with backfiring into intake/ hard start / no start.
at least one noted water in the plugwells after an engine wash, so basically another electrical issue.
haven't seen egr listed as a root cause, but can't hurt to check/clean the dpfe and the egr "nostrils".