Hey everyone, I have a 1994 E420 with the "Check Engine Light" On. It runs great except after the engine warms up when the car runs rough when you come to a red light with the foot on the brake. The RPMs also sometimes flucuate below 500 RPM and the engine runs a little rough when the engine is warm. If I put the transmission in neutral, the RPMs go to 600 RPM and runs smoother. What do you think it is? Since the "Check Engine" light is on, I have a feeling I need an oxygen sensor, but not sure. Also I believe the plugs were changed in January and not a lot of miles put on since then. Also a new air filter was put on recently. It is possible that the wrong plugs are in there, but it seems like it is something else.

Also, when the car warms up, the blinkers sometime don't work. Also the main cig lighter doesn't work. I checked fuse and they appear okay.

Please help.

Matt
1990 E420, 140k miles

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1990 Mercedes 300 SEL (320,000 miles)
1994 Mercedes E420 (140,000 miles)