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All the other stuff has been mentioned.
The idle speed needs to be set within the normal rpm range.
When mine shook at hot idle it was the stock Injector Nozzles that were causing most of the problem.
They were apparently the Originals and what I found is that the Central Drilled and cross Drilled Holes in the Spray Nozzle Pintels were completely pluged solid with Carbon.
All most all of the ones I have pulled at the Junk Yard werr in the same state.
Rebuilding the Injectors with new Nozzles cured the major part of the shaking.
The Central Hole is where the Fuel is supposed to come out of during idle and low speeds.
Holes #14 and #15 in the pic.
Ounce the holes are plugged solidly I do not believe a Diesel Purge is going to clean out the Carbon as the chemical will just pass around the obstruction.
However, a Diesel Purge may keep the passeages open if done before they are completely plugged.
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84 300D, 82 Volvo 244Gl Diesel
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