Since you have the first generation Bosch D jetronic electronic fuel injection, you have "trigger points" in the base of the distributor that tell the injectors when to fire. These tend to get contaminated with oil seeping up the distributor shaft on older distributors, and this can cause "misfires"/rough running. If they are not too worn, they can be cleaned up and reused...but you still have the problem of subsequent oil contamination. Short of getting a new distributor (which you can't...no longer available), my solution was to fabricate a disc out of absorbent material that fits over the distributor shaft below the trigger points and the O.D. being the same size as the interior of the distributor housing. A cut through the disc from the center hole to the outside will enable you to fit the disc without disassebling the distributor. This will absorb quite a lot of oil before the trigger points get contaminated again, and unless you plan on driving your car a whole lot, it should solve the problem for several years.

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Berfinroy in CT
Present vehicles:
1973 300 SEL 4.5
1959 Rolls Royce Silver Cloud I
1959 Ford Thunderbird convertible/430
Past vehicles;
1958 Bentley S 1
1976 ex-Max Hoffman 6.9
1970 300SEL 2.8
1958 Jaguar MK IX
1961 Jaguar MK IX
1963 Jaguar E-type factory special roadster
1948 Plymouth woody
1955 Morgan plus 4
1966 Shelby GT350H Mustang