Hey all. I've replaced both the fuel pressure regulator and the injector resistor box, and I'm still getting the same symptoms. What's more, now my brand new spark plugs are totally fouled. I've attached a picture. This happened after only about 4-5 seconds of running. If I plug in the injectors and attempt to start the car, it seems the cylinders fill with fuel, and when I unplug the injectors and start the car, I can get the car running for a number of seconds, but when I do it fouls the plugs.
I'll test injectors next.
I'm getting a really violent knock when I try to start the car, which for now I'm just going to assume is a byproduct of having so much fuel in the cylinders. Makes me nervous as hell, though.