It is in your gov spring setup, try backing both sides off 1 or 2 clicks. I don't know much about tst springs but some others the seat is too thick and must have .020 machined off the be able to obtain a strong idle. I ended up spending the money for a good set of bosch springs, made life much better. A grabby dual disk and weak idle are not a fun combo. You will find most guys who have issues are running a manual transmission.
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1996 3500 4x4 5spd
1991 D350 5spd
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