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The gauge was a litte out of calibration. (It wasn't new - it was one I put together using fittings etc. I had around.) I put a different (much higher quality) gauge into the setup, and it read 44.0 psi. Still very slightly high, but I'm sure it's not the cause of my issues.
The thing I'm thinking of underneath the intake manifold is the oil trap. I see per the manual that it doesn't have any vacuum connections to it. The one vacuum connection I was thinking of is the one that's in the dual pipe with the oil trap line that goes back to by the turbocharger. The other end of that vacuum connection is the one Klaus mentioned behind the power steering pump. That connection looks good, and is a relatively new elbow.
I will follow up with a good vacuum leak test. Not tonight - it's late, and I'm already in the doghouse because I spilled a bit of gas re-checking the FPR, and the smell got in the house. 8-( I think I'll go for the propane test, outside (when it's not raining). And yes, when I put it all back together after doing the knock sensors, I used the cheap intake manifold gasket. (Didn't think so at the time, but now...) So I'll be sniffing all around there, and see what I can come up with.
Roger
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