Where to Start?
Ok I know this seems to be a popular topic lately, but I need to know where to start. I have a 2003 F-350 with 96,000 miles (apparently the magic #) and for almost 2 weeks now it has been running rough until it reaches about 160* ECT. Once it gets warmed up it runs like a champ. The fuel mileage hasn't changed, and power is normal once it is warmed up. I have read everything from needing to get the ECU reflashed, to I need to replace the FICM. My extended warranty died about 3 months ago, and I am past the 5 year cut off so everything is coming out of pocket and I really don't want to start throwing $800 parts at it without somewhere to start. There are no codes new or old, no CEL on, new motorcraft fuel filters, new motorcraft oil filter and oil, and I have gotten fuel at the same place since the truck was new. I haven't spent much time working on 6.0's since I have had almost no trouble out of mine since new, but I know gas engines will throw a code most of the time with a misfire on a cylinder and that is what has me stumped. The truck computer is not giving me anywhere to start, so I am looking for experience with this problem. What is the likely culprit and where should I start spending my lifes savings? I have been reading other posts for over 3 hours now and haven't found an answer, (Forgive me if I overlooked it). Thanks in advance.