It does it both when the a/c is on or off, whether the car is hot or cold, and in both drive and reverse.
Example: I approach a stop light/sign and come to a complete stop. The car almost dies (sometimes it does) then it revs up to 2k +/-
Example: I start the car put it in gear and it almost dies then revs as in my first example.
It does not do it when driving or accelerating.
Thanks for everyone’s input.
1973 280 - Sold
1980 300SD - Sold
1982 240D - Stolen
1988 300E - Sold
1989 260E - Sold
1994 E420 - Sold