2001 Ram 5.9 Magnum running rough, won't idle, getting codes P0205 P0207.

Here's the vehicle: 2001 Dodge Ram 1500 5.9L (gas) 4x4 with off-road and sport package. It has 238k miles on the odometer.
I have owned it since 2002 and 30k miles. The truck is "stock" or stock equivalent, meaning no significant engine mods other than the usual repairs and replacement parts it has needed over the years. The internals of the engine are still factory. I have no tuners or tunes on it. It has been well maintained.

About a month ago now, I got into the truck one morning to go to work. The truck fired right up but I could tell it was running really rough.
Within 10 seconds, I had to keep pedaling the gas in order to keep it running, otherwise it eventually sputters out and dies.
The check engine light came on and I’m getting codes P0205 and P0207.
The previous night before this started, I filled the tank with 93 octane shell gas, and drove about 100 miles on mostly interstate roads (70mph), so the tank is just more than half full.
My first thought was fuel pump related, since it's the original. But I can hear it coming on it sounds like normal. I checked the fuel pressure at the fuel rail test port and getting a consistent 41 psi.

I used a ‘noid test light and all injectors are pulsing light like they should.

I unplugged each fuel injector connector and probed 12v+ from the ASD. No issues found. I’m getting 12.2-12.9 volts before the ASD shuts down power. When the ASD shuts down, the voltage drops to between 5 and 8 millivolts. When the key is turned off, the voltage drops to 0.

I disconnected the wiring harness from PCM and probed from each pin on the wiring harness to each injector connector. Voltage is steady and consistent (12.5v) across the driver wires from the PCM harness to the injector.

I checked the resistance across each of the injectors. No issues found. Ohms across the injectors range from 12.5 to 12.8.

I supplied 12v power to each of the injectors with the multimeter in the loop. They all click when 12v power is applied and 12.5 volts was observed across all injectors.

Just hoping it was an injector problem, I replaced the #7 fuel injector with a remanufactured one from a reputable online parts site. No change.
Still running rough, still getting those 2 codes. Old injector was fine, but I’ve not swapped it back in, for now anyway.

Out of desperation, I replaced the PCM with a remanufactured one from a reputable online computer repair shop. With the new PCM, the behavior is the same, including the codes.
I put my old PCM back in and there's no change.

If I keep it running long enough, it will generate misfires in cylinder 5, cylinder 7, and cylinder 8...Just throwing that in there as i think it's just a result of something else, but never know.
I have disconnected the battery many times. I’ve let it sit overnight or even several days with the battery disconnected before trying again or reading codes.

From what I can tell, the fuel injectors are fine. The 12v+ (power) from the ASD is fine across the injectors. The 12v- (driver/ground) from the PCM is fine across the injectors.
The ASD is shutting down after ~1.5 seconds like it should. The PCM is not the problem.

The spark plugs and spark plug wires look to be OK. I'm getting fire on plugs 5 and 7.

At this point I don't know what else to check, replace, or do for that matter. What else could be causing the rough running and P0205 and P0207 codes?

I've searched high and low for answers but nothing has made a difference. There is a post that is almost identical to this, but the post ends unresolved.
Hopefully someone out there has resolved this issue before and can point me down the right path.

 

When was the last tune up and how old are the O2 sensors?

 

Fuel pressure should be 49 PSI...... and we have recently had a member that his pressure was 44psi, and was causing misfires.......

What is running fuel pressure? Still 41? Likely time for a fuel pump. (you have gotten a good run out of that one in any event...... )

 

Plugs and wires were replaced in march 2019 when i was changing the valve cover gaskets.
Distributor and rotor were replaced in november 2018. Both were proactive maintenance, no issues showed.
02 sensors are at least 10 years old now. I have considered this as a possibility but i can't wrap my head around how this would cause an injector circuit error.
Is there an electrical test i can perform on the 02 sensors?

 

Unplug 'em, and see if it runs better.

 

I will go run another test and post back shortly. 41 seemed within spec to me, but maybe not.

 

Static pressure test with just priming the fuel pump was 45 PSI this time.
The needle "bounces" between 47 and 52 while running. Would that average to 49-50?

Thank you for your help by the way! I'm really lost on this one.

 

Fuel pressure is good there. Can you monitor it at WOT?

 

I pretty much have to keep it WOT to keep it running.
It's definitely getting gas up there and to the injectors.
I love the smell of rich running engines, except when it's mine.

 

Running rich I would assume the 02 sensors (mostly the front one)