My D-max has 23k on it. I am on my 3rd fuel filter, (changed it about 2k ago). I am getting a rough idle. No smoke though. I am adding aditive for the last 13k. No lights are on either. The rought idle comes and goes.

I could not find anything with no smoke. Thats why I am asking. Thanks

I have a 04 2500hd and is doing the samething. I cannot get an answer to what is wrong.