Marty,

Verify the items that "Jims500e" suggested are operating and functioning correctly. His suggestions are a very insightful for your model of car. As always, I like to start with the least expensive - especially his suggestion about checking the battery voltage and/or faulty voltage regulator. These cars don't behave very well with sporadic or low voltage. When you physically view the condition of the wiring harness do you notice any cracked or broken sheathing on any of the wires? Make sure the wiring was not just repaired. Make sure the "brown" ground wire from the wiring harness is tight -(located next to fuel rail injector, passenger side, about 2nd-3rd plug back from front)


(not ASR )
What is the condition of maintenance items such as plugs, rotors, rotor caps, fuel filter, O2sensor? Broken or cracked hoses are common on older m119 engines which cause vacuum leaks which leads to poor, erratic engine performance. Also check for excessive carbon build up in the throttle body - especially around the butterfly flap. Cleaning the throttle body on my 400e helped the sticking peddle and idle.

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Russell McMahon
Tulsa, OK
2001 CLK 320
1992 400se
1993 400e
2000 320ML