There is an irregular knocking coming that I can feel under driver side foot rest/floor. It is not constant or consistent. Very random in occurrence, it literally sounds/feels like someone knocking right under the bottom where the floor is. It is one or two knocks at random. Doesn't even sound like metal on metal. It's muffled so I only feel/hear it if I sit idling and have to have my feet planted on the floor.

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1990 190E 3.0L