It would certainly be a good idea to rule out vacuum leaks -- trace every vac hose connecting in the the intake manifold. I had problems with disintegrating injector seals on my B200E causing idle problems. They are not difficult to replace -- there are two sizes that you need.
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 Present: 1990 240GL saloon, 1992 240 estate
Past: 1988 240GL; 1971 144DL; 1972 145DL
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