2002 Chevy 5.3 Fuel Injector Shenanigans

[OODRCustoms]

2002 5.3l 
Truck ran OK, but long term fuel trim was way too high. 
Replaced injectors with Delphi, same brand and part number as the old ones. 
Install went OK.
What I forgot, was I had unplugged 1 coil, and left the fuel pressure regulator unplugged when I first started it.
It idled like crap, then realized, plugged them back in properly. 
Truck still ran like crap. Later in the day, come to find the engine not cranking, like it was locked up. 
This morning I pulled the plugs, and wires, which were all DEFINITELY toast, gas poured out of the plug holes.
Manually turned the motor, seemed ok, not locked up.
Oil dipstick smells like gasoline, so I will be changing the oil. 
I have new ACDelco Iridium Plugs and new wires on the way.
So my question is, should I try running it with new plugs first? Or should I try something else for fuel injectors.
(Side note: I now have 0 fuel pressure, I can hear the pump for a second when I turn the key, I’m assuming this may be because I emptied the fuel rails of fuel, and haven’t ran the truck yet, so the vacuum for the fuel pressure regulator hasn’t run at all)
Any help is greatly appreciated, thanks!

[CamGTP]

How many cylinders had fuel in them?

 

Fuel can only get into the cylinders if they are leaking through the injectors while they are just sitting. That would mean the injectors are faulty.

 

High values on the long term fuel trims also means it's lean, usually like a vacuum leak or low fuel pressure. Your stock injectors may have been fine.