A rough running motor or lack of power can be caused by a failed distributor cap or rotor, ignition wires (or their resistors), or valve cover gasket leaks. If the valve cover gasket leaks, oil can pool where the ignition wire resistor connects to the spark plug. The resistor can fail and the spark plug may not fire because of a short circuit through the oil.
Rough Running Engine Due to Misfire on Mercedes-Benz 560SEL
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When you first crank the engine has a really rough idle. When it runs for 15 to 20 minutes it will smooth right out. I changed the spark plugs and wires and the rotor, but still the same