Check the mixture readings next. Easy to do, and it sets a good baseline.

DOes the car start easily? How are the warm up charactersitics? WHEN exactly does it hesitate?

__________________
'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E