1985 745t

Recently whenever I first start driving my car after it has sat and gone cold the engine is incredibly retarded. It will run alright for most of the black in the turbo gauge, but the second it approaches the yellow boost area I can feel it turn into a slug (like its struggling for air or being held back).

I had this kind of problem more erratically before (it woiuld "suddenly" get retarded when it was hot out in the summer on occasion) and solved it by reseating the AMM connector at the AMM (unplug and replug). I haven't tried that now, but it seems like its currently to regular (only when cold) to be solved that way. Additionally the fact that it goes away on its own when the car warms up leads me to believe it isnt the connector.

So does anyone know what this might be? Is my AMM dying? Something else?

Thanks,
Rick