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I am not so sure about the O2 sensor. If it is going bad, it could affect the idle and could be causing the car to run way too lean when he steps on the gas. That is what happened on my 528e. I believe the fuel injection system is pretty much the same on the MB as on the BMW.
Try unplugging it. That will send the system into open mode and the fuel injection will work against the pre-programmed maps and not try to fine tune the fuel. I did that and the idle problems went away and it accelerated better. I still have to get around to pulling RnRing the sensor.
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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy"
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Monika '74 450 SL
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FoxyCleopatra '99 Chevy Suburban
Scarlett 2014 Jeep Cherokee
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'74 Jeep CJ5
'97 Jeep ZJ Laredo
Rudolf ‘86 300SDL
Bruno '81 300SD
Fritzi '84 BMW
'92 Subaru
'96 Impala SS
'71 Buick GS conv
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