Thank you guys for the input. I do try to get my fuel from the truck stop right off the highway, but the Hess station is the only place I drive by coming home from work that sells Diesel, so its just convienent. Whats really weird is how quick it started, I have bought fuel there before, but...
The last few weeks I have been chasing a rough idle condition and finally tracked it down. Hess Fuel. For whatever reason anytime I fill up at the local Hess station the truck idles rough, smokes more under hard throttle, lower fuel economy, and sluggish acceleration. If I go to any other...
The rear tires would be your best bet. If they are bald thats a good sign. Also the inside of the exhaust pipe. If its black as night and covered in carbon, then you know a lot of unburned fuel has flown through it.
If you suspect a module I would suggest looking under the hood. You will...