mb says my car was not part of any recall / campaign but it sure had the wiring harness problem right at the injectors as Gilly says. you touched one and it would start stumbling and running rough, another touch would smoothen it temporarily. a new harness took care of the problem. i was a 2nd owner and dealers won't even talk about courtesy fixes if you're not the original owner. and BTW my problem manifested when i had the head gasket fixed - when they put the top back together it just ran very rough.
mb may be a classy car but MBUSA has no class in dealing with these problems.
1993 300e-2.8 - gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"