[rbuswell]

All hoses are plugged into the correct Ys and sensors from what I can tell. I did not take each hose off and test it for leaks. That seems to be counter-indicated since the symptom only happens in a narrow RPM and gear range. In my experience, cars don't run well across the board with vacuum leaks or when hoses are plugged into the wrong port. If any Pelican has experience to the contrary, I'm open to rebuilding the vacuum hose array if needed.

I thought my fuel pressure tester had a higher PSI range than it does so I have ordered another one. Expect it by tomorrow. I may still need to build a fuel rail adapter per the tutorial in Clark's Garage. Didn't want to go down that path until I know my new tester doesn't include the right adapter first.

Found a sentence in Clark's write up on fuel regulators that gave me hope that the regulator may be the culprit. It didn't describe my car's symptoms exactly but sounded close.