When you say rough what do you mean. Is it missing or does the engine shake? You may need to change therack dampener on the IP. Mine idled rough at first after is warmed up. After I changed the dampener it smoothed right out.

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Mark
82 300SD 110k
91 Caprice SS
92 Jetta TD
97 Cadillac Concours(300hp)
84 Celebrity 4.3L diesel