Okay, so I'm under the hood, looking over my vaccum system, and I glance down at my IP mounting flange, and notice that there is a chisel mark on the IP and again on the block, and they aren't inline. the IP has been rotated
2mm clockwise. I know they are there from IP timing, and there's wrench marks on the #1 Injector line, so I'll assume that the IP timing has been adjusted...engine runs great, but needs to be plugged in at
temps below -10.C Should I move it back and see how the engine behaves?

How closely tied is IP timing to valve adjustment?

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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Clockwise? Do you mean rotated toward the engine or towards the fender?

If it runs well, I'd leave it be. Most of these should be plugged in below freezing anyways.

Or as they say here: if it aint broke,fix it till it is broke....

In most cases, the IP is rotated closer to the engine than would be indicated by the marks. This is because the timing chain has elongated with wear and the IP must be advanced to keep the engine in proper timing.

If this is the situation, just leave it where it is.

If, however, the IP is rotated away from the engine and the marks are not aligned, I might be curious as to why.