Since you are not getting the ASR light on the bottom line of indicator lights, it does make sense that yours is not an air issue.

Even if it does not eventually resolve the cold weather limp problem, I at least hope the new breather hose I install this weekend will completely smooth out my idle.

Is there a list or chart of conditions that would trigger limp mode?

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black