So, I'm going to take the advice I saw in another new member post and just post my issue here....I don't want to make a bunch of quick BS posts elsewhere just to get my post count up...
I have a crank, no start problem. After being on the highway for about an hour with everything working fine, I stopped for gas not far from my house with 1/4 tank left. After pumping was done, Jeep no longer starts. So a well warmed engine, stopped for maybe 5 minutes. Turns over for forever and if I stomp the gas pedal it will eventually come to life (at like 3-4k RPM), but it's not firing on all cylinders or misfiring. I can keep it running this way if I hold the RPMs above 1.5k, but it will die if I let off. No codes being thrown via code reader or the "key dance". No unusual behavior with any of the indicator lights.
-Battery Voltage is 12.5ish, stays around 11v while cranking
-Fuel Pump primes/runs when ignition is turned on, I have tried turning ignition on for a few seconds, off, on again, off, then crank to make sure pressure is primed. No way to easily check pressure on the 5.7s
-Put in a new Oil Pressure Sensor a few months ago (it threw all the related codes)
-All fuses are good
-New Air filter
-Replaced the Crank Pos. Sensor yesterday and was able to get it to start fairly normally, but still ran really bad- not all cylinders, misfire, or whatever. Every time I started it, it got a little worse, harder to start to where eventually I was back to the original symptoms. This was after 4-5 start and runs. The 2nd start I did drive it a little bit around my cul-de-sac, but the misfire concerned me so I parked it again.
-After this, I unplugged the battery for a few hours to potentially clear anything in any of the computers, no changes. It's been sitting for 2 days now, so any heat or time related things would have sorted out.
Other notes- a few months ago, right after the Oil Sensor was replaced I was getting random P0158 codes that would come and go for about a week, O2 Circuit High Voltage, Bank 2 Sensor 2. I never did anything about it because the code went away on it's own and this was...2 months ago? Maybe more?
Over the past year I've had maybe 3 times where the Jeep took a little longer to start than normal, like the fuel pressure check valve hadn't done it's job and the pump was playing catch-up on pressure. But still fired up and ran fine.
I do have a remote starter installed, and have for years. I know it does interact with the CANBUS, I think even in-line with some of the wires, but I don't think this is the culprit since I can get the Jeep to kind-of start and I've installed hundreds of these remote starters and never had them cause issues this long after being installed (they would have screwed stuff up from the very beginning).
I have not pulled any spark plugs yet, probably will anyways after posting this, to check for spark and just see what one looks like. I don't feel like the condition of the plugs would have caused such an abrupt "failure", though.
EDIT: Pulled 2 plugs, they look fine and have spark the entire time the engine cranks.