F4i log:
I've swapped plugs, checked coils, and used the ol' screw driver to the ear injector test. Everything seems to be working. Intend to pick up a compression tester hose adapter that fits to check the compression. I fear a valve may be bent, but I have no solid evidence as it doesn't feel like anything's touching when I rotate the engine.
My only logical explanation thus far is that due to the FPR being between the fuel line and that lone injector it's causing it to not get enough (if any) fuel to fire said cylinder.
Working on getting a job at a glass factory, if all goes well this turd will be even more temporary than originally planned.