[Shotimes] Random Hard to start issue "flooded"

[Leigh Smith]

I need the help of someone who's been thru this one. Any ideas on how to
troubleshoot?
..
Symptoms: Random no-start or hard to start; appears flooded, and starts easily
with foot on floor to clear the "choke". Fuel pressure sometimes drops while
sitting 15min to 1 hour to zero psi.
..
Car: 94 MTX; brand new factory crate engine, original: injectors, fuel pump,
O2's (100k). New: fuel/air filter, IAB, CID, CPS, wires, plugs, etc.
NO codes.
..
I'm thinking A) leaking fuel pump and/or check valve B) leaking injector C)
leaking fuel pressure regulator.
..
Any other ideas?
Or ideas to troubleshoot?
Lee