Follow up on my previously posted
problem with a rough bumpy idle
which eluded the auto mechanic
and diagnostic equipment.
The 'camshaft adjuster magnet'
was replaced (located at front of engine).
It no longer bumps and surges
on one cylinder while idling
(although there is slight sublime
turbulence persisting in idle.
I added injector cleaner to tank
and hopefully that will diminish or
end that.

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1979 300D
133K miles
1989 300SE
1995 C280