Sounds like there's a vacuum leak, the modulator valve needs to be adjusted and if what you mean by the "rear bank" is at the back of the cylinder head just above the bell housing then it sounds like the head gasket is bad. Is there any oil in the coolant or vice-versa?

A vacuum leak can cause both rough shifting and a rough idle

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89 300te 222,222
92 300e 190,000

Hard shift and bad idle sound like a major vac leak. Check ALL the rubber hoses and connectors on the engine, they are likely quite dead by now if not replaced. Worst offenders are the idle control valve hoses.

Another possibility is the OVP relay going bad, causing erattic mixture control, or a bad O2 sensor. Check duty cycle and EHA currrent.

And check for dead engine mounts -- they will cause severe idle vibration as the engine is mounted on springs when the glycol damping fluid leaks out! Harsh shifts can also be a bad tranny mount, or bad diff mounts allowing the diff to bang. Bad flex disk is also a possiblity for the hard shifts. If it's bad, it will bang especially badly on downshifts whilst coming to a stop.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!