Since I last posted, I did put the fuel pressure tester back on it. Sure enough, it was struggling at 18 psi. It is also still throwing a P171 code, which is lean bank 1, I believe.
Thank you Pete, I’ll check out the relay.
Castironman, I did check the vacuum hose. It was pulling a vacuum. I also checked to see how the engine responded when I removed the hose. It checked out. (I can’t remember off the top of my head, I suppose it would decrease the fuel pressure). No accidents or body damage, but I’ll definitely take a crack at those diagrams and see if I can find this thing. Thanks so much for the great info!
A guy today told me it could still be the fuel pump because I used the off the shelf one from autozone, not the manufacturers. I (politely) told him to take a hike, probably because I just would hate to admit I spent so much effort doing it wrong. Should I be listening to him? The probability of getting the exact same (somewhat baxar) symptoms 2 days after the brand new fuel pump goes in just seems astronomical to me. Open to thoughts, though, (and I promise I won’t tell you to take a hike). 