my 300 e is acting the same way but only after i washed the motor. i'm in the process of finding a small oil leak and needed things clean. after the car warmed up it started running rough then just quit, BUT bucked and snorted when i tried to restart it. it finally did restart and at home i took everything apart and let it dry out. cap,rotor, wires and such. it was also a warm day. it has not done it since. the problem with my car that seems unusual is the bucking and snorting, like being out of time.

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85 300 sd 168k current driver
85 300 sd parts
81 380 sl 125k
84 190 d 160k just bought!