Wouldn't hooking the car up to the SDS (or whatever it's called these days) pintpoint the issue fairly quickly, and be a lot less expensive than re-building the motor one part at a time? Tell me that the shop that did all the work wasn't Steve B's place!

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't