bought 03 F350drw appox 3 mo ago , ran great for first 1500 mi and then started to cut out just before shifting to next gear , had oil changed at 5000 mi and it quite cutting out for the next 1500 mi and then it started cutting out again. It run great other than that . also it other cuts out between 2500 and 3000 rpms ?????

 

Here is what I would do:

Change your oil again w/ new filter make sure your using an approved oil ( check this site for reccomendations)
If the problem goes away again, I would start thinking about your injectors being the problem. They need the right amount of good clean oil.
Check this site for the "hot shot" oil additive that might work in your case.

 

i also have an 03 DRW Fx4

change the oil with Rottela syn 5w-40
and use LUCAS upper cylinder lubricant additive in your fuel
ill bet itll solve your injector problems

and continue this every fillup and every oil change

 

last 2 oil changes done by ford . I do use the gray bottle and it doesn't seem to change anything. Thank for your help .
PS if I keep the rpm's above 3k or below 2.5k when it shifts I have no miss.

 

If your going to own a 6.0 PSD I strongly suggest you change your own oil and filters. As I stated before oil is critical to the 6.0, and I would not trust anybody but myself to change it. Case in point: My buddy who just had his first "free" oil change at a Chevy dealer on his new DuraMax, found out they put regular oil in it, not the diesel oil called for.So much for dealers.