I would start by replacing the distributor cap and rotor, and the spark plug leads if these are more than about 5 years old. Rotor arms don't seem to last as long as they used to. If symptoms persist, try cleaning the IAC valve and the throttle body.
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 Present: 1990 240GL saloon, 1992 240 estate
Past: 1988 240GL; 1971 144DL; 1972 145DL
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