Originally Posted by greythunder

today in a hopes of solving a miss at idle, and rough idle after changing delivery valve seals and washers, see thread:

http://www.peachparts.com/shopforum/diesel-discussion/365524-new-delivery-valve-seals-now.html

i replaced both my fuel filters. upon taking the old small one off i noticed black sand spec stuff on the screen.

then i noticed after driving about 50 miles today the new one already has some on it!!!!

wth is this stuff?

link to miss at idle and noise from engine. engine was at temp.

https://www.youtube.com/watch?v=lrCZYL4UdTo