[monkeyodeath]

So I think I've made more progress.

Pretty sure that the fuel pump is not the issue. Jumpered the relay and noticed that the pressure never drops, even when the car stumbles. So the stumble isn't being caused by an FP that's browning out.

What I notice when the car stumbles is that I hear the definite hissing sound of a miss. When I'm revving the engine, I can't really hear or feel a miss, but I do notice the occasional strong puff of exhaust if I put my hand near it.

I'm thinking either one cylinder isn't getting consistent spark or the injector is stuck. Thinking maybe an IR thermometer might help -- find the cooler cylinder.

Though the miss is so occasional it might be hard to find.

Wonder if it might be a clogged injector that was limping along back when the FPR was stuck high. Now that fuel pressure is back to normal, it's dribbling enough to mess up combustion every once in a while.