Don't be too sure. I would almost bank on jumped timing. I had the same problem with my 380SE until I pulled the valve covers and discovered exactly that. Prior to that, I replaced injectors, wires, cap, rotor, plugs, all to no avail. Have him check the timing. I was sooo damn lucky the chain didn't break. Rolled in a new chain, put in a new tensioner, 4 upper rails and it ran like new once again.

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Rgds,
Aaron Greenberg
MB technician
Precision Motorcars, Cincinnati, Ohio
'67 250SE Cabriolet
'77 450SL
'80 300SD
'85 380SE
'86 420SEL
'89 420SEL
'93 300E 2.8
'74 Jensen Interceptor Mk.III
'81 DeLorean DMC12
'84 BMW 745i Turbo