When you put the transmission in neutral you take the drag load from the engine, the engine speeds up and at the same time becomes much smoother. You might possibly do a compression check when convenient to see that all is well. With low compression on one cylinder they will shake a little more at idle and still run pretty good. The five cylinder is a difficult engine to keep smooth at low engine speed. I don't think in anyway that the problem is connected to the transmission.

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Junqueyardjim
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1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

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