new here and new to diesels,had this truck about 6mths,71000 on it,left work one morning bout 5 degrees above,.warm truck for 20 min or so,ran fine till I got bout 6 miles down the road then it fell on its face,..limped home,pulled filters and changed,..ran good for a couple of days,.then it started missing around 5o-55mph,..smooths out about 60. ran like that a couple days then fell on its face again. drained the main filter at siderail,got a brown looking sediment out of it ,changed filters again added a biocide and injector cleaner from Stanadyne, running that through it now,then I'll change filters again.Question is do you think this will cure my problem or do I have something else wrong,? thanks