I have no idea how old they are...did you have to replace the fuel distributor? How did you determine that was the problem?

What throws me on this problem, is that it runs perfect right after startup, then it starts acting weird after a short while. Runs perfect for longer when cold, when the engine is warm, it will run ok, then within a minute or two it will start bogging down and idling roughly. I noticed my fuel pump is buzzing and sounds kinda sickly...I'm going to take it back to the benz specialist and have him check the fuel system control pressure.

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles