If your car is infact a 280CE, the E stands for injection. I would think that the ilde valve is faulty. This engine has an idle valve that is coolant temperature dependent. It will decrease the engine as the coolant warms.
After the valve problem is looked at, you could have the base idle adjusted on this engine.
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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS
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