I have a 2007 dodge ram 2500 with the 5.9, a month ago i took a 2200 mile trip. About 1000 miles in it started getting hard to start, takes around 10 seconds of cranking when warm and 15-30 when its cold if it starts at all. Sometimes it wont start unless i spray some starter fluid in her which i hate to do! No check engine light, but put it on a hand deal and code PO477 comes up which is back pressure in the exhaust. It has had the exhaut delete and aftermarket exhaust put on it,. Anything could hep before i drop a couple hundred for a shop to look at her