It sounds to me like a symptom of a bad engine wiring harness.

They were bad on all MB's with the M104 engine from 93-95.

Do you know if yours has been replaced?

Do a search on engine wiring harness, and you'll be up all night reading.

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".