Epilogue - My daughter's been driving the Alero the most, but on the few times I had it out after all this it just seemed not to have the "zip" it used to; I was even thinking there might be a prob with the transmission, since when you give it some gas, get it to kick down a gear and accelerate, it just didn't accelerate like it used to. But yesterday I finally got around to replacing the fuel pressure regulator ($33 Standard Motor Products PR234 from Amazon, even RockAuto couldn't beat that). When I first turned the key on the fuel pressure went right up to 60 psi, and settled at 57 psi with engine idling. It had been between 47-50 psi with the old regulator. It may be my imagination, but it seems like the "zip" is back and the old regulator was wearing out.