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What does your fuel gauge say? "Knocking" is a pretty normal term with a diesel, however, lack of fuel will cause loss of power and a louder knocking sound. If you're below 1/4 tank, add some fuel. It'll still perform sadly for a few miles, but will clear up.
2002 F250 CCSB 4x4
PHP Phoenix, John Woods VB, NUC bypass, 6637
"No country can be called free which is governed by an absolute power;
and it matters not whether it be an absolute royal power or an absolute
legislative power, as the consequences will be the same to the people."
--Thomas Paine, Four Letters on Interesting Subjects, 1776