Bled fuel lines,motor stalling,missing,runs well under load

No engine stated of the 3 possible, wow !
x2 there is never a need to bleed fuel lines. ever.
the pump and reg from a loop it does that all by self.
why not post full symptoms. (parked ,driving , hot and cold engine)
the PCM runs in many modes, all matter.
x2, i can list 100 things why would you try to guess 100 timings, OP.
all that matters in your post i the word MISSING, called MISFIRE.

misfire does ALL that, .
top cause for misfire are (when real bad all engines stall)

1. never ever tuned up this decade, spark and filters parts. duh?
2. bad fuel
3. bad engine, (compression good on all cylinders)
4. injector leak down tests passing.
5. fuel pressure at spec.
6. forgetting to use a scan tool at stall, why bad that idea.
7. EGR stuck open all cars stall, clean it. (if equipped)

Why would you bleed a fuel line? The electric pump, if it is giving good pressure, will deliver plenty of fuel. Any codes? What codes?
At this juncture, it could be nearly anything, including a low pressure delivery from the pump. Tell us more so we can help you better!