I was experiencing the low power problem until I saw that my accelerator cable was pretty well baked under the hood where it meets the linkage. A turn to the left and took up the slack, and then vvvvvrrrooooom!!! off the car went.

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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