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Quick update - all information I am able to find states 17 to 23 inches of HG (8.35 psi to 11.3 psi) for proper intake vacuum. This contradicts the Porsche information I had (5.8psi to 8.7 psi) but I imagine being within a +/- 1 psi might be acceptable.
Only posting this because if I have proper intake vacuum, it seems less likely I have a vacuum leak, so I'm hoping those numbers jump out. If not, I think this leaves me with the EVAP system (electric valve stuck open? but no CEL or code?) and then it's on to mechanical problems with the engine (timing, valve seat issues, compression).
Thanks for your time!
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