Tuesdak, Right now the truck starts like it always has it just has a miss to it or stumble. Run it up to say 1200 rpm's it shakes and it sounds like huffing or something similar to a Huey, hard to describe. Relocating back to Texas I hauled about 6k pounds close to 800 miles it was perfect. The next day I started it and it definitely had a miss to it, I thought it may have been the a/c compressor or something on the front but none of that is causing it. I have yet to put my code reader on it, was busy checking out the front of the engine for anything going wrong. This on my 2004.5 dually, NV5600.