Lower CCV hose replaced, and I'm back to 0-3% short-term fuel trims - thank you everyone for your pointers on this!

One last thing to leave for other members experiencing similar problems before closing this thread out:

After replacing the hose, I fired her up with my OBDII scanner attached. I viewed STFT's and was completely dismayed to see ~15% STFT adjustments. At first I figured I have more g-damn vacuum leaks, but then it occurred to me that this time they were negative instead of positive.

In essence, the long-term fuel trims had "compensated" for my prior massive vacuum leaks, and when those were corrected, the short-term fuel trims swung the other way.

Clear your adaptations after making these vacuum leak repairs (clearing error codes is not enough)! Otherwise, it will take a bit of driving for things to get back to normal.

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2012 xDrive35d
2001 BMW X5 3.0i 5MT
and two 1987 Corvettes - Callaway Twin Turbo and Guldstrand Grand Sport 80
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