1992 300 e 187 k miles. About 6 months ago the engine had a loss of power where the accel. would be floored and the car would fall flat. A temporary fix was a vac. leak and 15k miles later the scenario revisits . Oil in coolant- time for 30 -70 k head gasket change!

Symptom persists after gask renewal and cat. check. Car will idle normally when air pump is on ( rich) and then lose power after a few revs in warm up phase.

If you press on the disc on the intake the engine will richen and normalize.
EHA ? Some type of potentiometer in the fuel distributor?

Ideas. ? New ignition ,chain, valve seals and gasket. Vac. ga reading was erratic as cat was suspected but verified nonissue.

No issues with exhaust.

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92 300e 205 k miles decent -wife's ride
91 300 TE many upgrades and very clean-Junk yard rescue ( son's "hot rod")
68 250 s Low rust great shape
91 300e 236k ( rear ended and sheared metal subframe mounts /sway bar )
85 300TD 310k

Below have moved on
77 300d 36k miles one elderly owner! Now in Ca fully restored
79 300 sd 49k miles( time capsule clean )sold and still in ohio
66 230s new at factory "das boot" gone.
93 190e 2.6 crunched-hard no injuries
69 220d rusted away