I got mine two years ago, and it ran really bad once it warmed up. I got new caps and rotors and plugs and it was 90% better even though the old caps and rotors didn't look that bad. When I changed the wire harness it ran 100%. These ignition systems can be tricky.

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1992 400E current
1988 300E sold
1973 280C totalled
1973 280SEL never got it running
1971 250C my first love but rusted out