I have the same car, and had the exact same problem. So I'm advising you from experience.

Check your engine mounts. A worn out, (or collapsed) engine mount(s) will cause the engine to tilt to one side, pulling the linkage with it. This in turn will cause the symptoms that you described.

Try also loosening the tension on the accelerator cable. This may help as well.

Phil

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'95 E300 Diesel, 264,000 Miles. [Sold it]