When I first got my '93 400E I had the same problem. The problem turned out to be a bad ETA (electronic throttle actuator). Hope yours isnt the problem. It can be an expensive repair.

__________________
Frank
84 500SEL EURO 101K ( JUST LIKE MY 1ST WIFE. GLAD TO GET RID OF HER! )
85 300D 310K (sold)
90 350SDL 184K sold
83 300D 118K (sold)
88 300E 153k (sold)
93 400E 105K (sold)