I have been having a similar problem with my 04 idling rough. It sounds like a gasser missing out on a cylinder. It got so bad at one point that the Service Engine Light came on. I didn't make it to the dealer before it went off tough. Just recently I had the code cleared and it came up as "Injector 2 Circuit Error" or something like that. Haven't found the problem yet. If anyone has expierenced this please let me know how to fix it.

 

Mine had this rough idle until I towed the trailer for the first time. have not felt it since.

 

I had come and go , a good romping would clear it up.I have not experienced it since it had the stock injectors though. When It first happened about two years ago , the truck was all stock & when I posted about it know one else was experiencing it. I think its injector related.

 

Did you replace the stock injectors with aftermarket ones? If so was it the whole injector or just the nozzles. I tried running the heck out of it everytime i drive it. That never helps. Any other ideas?!

 

Just posted a another problem read Chug-Chug-Chug and see if this has happened to anyone

 

Well I started using the blue bottle of stanadyne fuel treatment and it's 75% improved so I wonder what that means?? btw using it exactly to the letter of the directions about 9oz to 35 gallons according to my calculations.

Jamie