You may need a new rack dampener. They run $20-30.
It takes the oscillation out of the fuel rack at idle. A diesel tends to 'hunt' for its idle speed which causes the engine to shake. The dampener has a spring loaded pin which takes the back and forth motion out of the fuel rack.
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Mark
82 300SD 110k
91 Caprice SS
92 Jetta TD
97 Cadillac Concours(300hp)
84 Celebrity 4.3L diesel
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