sounds like a linkage problem. Try the stop lever again and look at where it moves the rest of the linkage. Then try to help along the part of the linkage that the stop lever moves. If that stops the engine, then something in your linkage needs adjustment and/or has too much play

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.