Stumped... What do you TBI guys think

[Andrij]

Hi I got the truck rebuilt the TBI changed out all sensors & vacuum lines, gas pump & filter, I wanted a great start! & for a month it wanted to run! 70mph was definately not a problem at just over 2000 rpm!
Then it started to not want to start. Ignition coil & new distributor & reset the truck with a timing light. Any time I work on it I have the new battery recharged the night before so I feel like I have a good base.
After the distributor & coil it had problems starting, & idling. It runs rough, dies alot. Last time I took it out it wanted to spudder & die off like it had no gas. I would push the gas & wait at first it wants to die, & then (if it doesn't die) at the last moment struggle to give power.
Appreciate any thoughts, just frusterated that it isn't running right.
Oh ya distributor isn't name brand. O2 sensor wasn't changed but everything else I got from AC Delco or Delphi.