No video, lost phone in Feb and had to get a cheap one with mediocre cam quality. Problem is still there, rough idle whether or not engine is cold. Opened up valve cover, removed rocker arms and sprayed penetrating oil on the valves and gave them a nice tap. Did nothing at all. I'm now wondering if that is even the problem. Anymore suggestions? Could it be something I am totall missing that is so easy to fix?

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1990 190E 3.0L