little update:
welp, took Scotty's advise and replaced the vacuum line off the regulator, no dice, still have the same problem. Popped over to Mike's this weekend and threw a fuel pressure regulator on it. no dice. still have a starting problem. basically if it sits for like an hour or more, it wont start first try, cycle the key, fires right up. After listening to Mike's truck start, mine definitely has a weak start, but we have no idea why.
as of right now, either I have done, or right before I bought it:
new fuel filter
new plugs
new wires
new FPR and vacuum line
Truck drives perfect, has power, so fuel side, the only other obvious answer is the fuel pump. but nothing is pointing that direction. Mike mused about it for a while and suggested I check my grounds and do a starter relay and ignition relay. eliminate some other small things. so next week on my vacation I'll do that and see if anything happens. Truck throws no codes, so if the relays don't work, it has to either be a starter or fuel pump. guess we'll find out.