It is down shifting correctly. Just went and put in a new Bosch 02 sensor today and still have the same problem (and as a side note, if I seem to be throwing parts at the cat because someone makes a suggestion, it's because I get the part free under its warranty.) Vacuum is at 18 hg. Actually now it seems like the throttle plate isn't opening correctly

__________________

1990 190E 3.0L