I have a 1982 Mercedes 280TE which was imported from Germany in 1987. I recently bought it and have been having troubles when it is first started running extremely rich. I have changed plugs and ran several cans of injector cleaner with little to no help. Once it runs for about 10 - 15 minutes it runs OK and the longer it runs the better it seems to run. I have been looking around this forum for ideas but most seem to be diesel related problems and not gasoline like this one. I am relatively new to the Mercedes field but am familuar with American cars. The car does have high milage 262,000 but does not appear to be using any oil and does run good once it is warmed up so I do believe the engine's basic mechanics are sound, no knocking or excessive ticking, mild value tick and no noticable smoke once it is warmed up but lots of black smoke when it is cold. Any help would be greatly appreciated. Thanks

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280TE W123