The o2 sensor was just replaced in August so it's not that old. I don't have exact numbers on voltage for it but the voltage does fluctuate until the engine reaches full operating temp.
I checked the fuel pressure at idle. I'm going to revisit that tomorrow and check it at WOT. Unfortunately I can't monitor it while driving. But it held a steady 39psi at idle with no deviation. Even after opening the purge valve on the gauge a few times it still returned to 39psi. So the fuel pump seems to be fine.
I tested the maf and the voltages were within factory spec so I'm confident that's not the issue.
I've checked for vacuum leaks several times with no signs showing. If I can't come up with anything by this weekend I'll be pulling the manifold off and replacing all the gaskets and hoses again. It was done once a year ago when the engine was rebuilt.
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