Try adjusting the rack damper screw on the back of the injection pump. Also, if it has a silver color spring, you should order a new one. The new ones have a stronger gold colored spring that will work much better.
When you are ready to install it, screw it in until it just touches the rack and tighten the jam nut.
A diesel purge can also help. Diesel Purge link
If you have not done a valve adjustment in the last 15,000 miles or within the last year, it's probably due for it. Valve adjust link