sluggish running

I have a 94.5 7.3 and as I drive the truck will die. It does this for about thirty minutes or 20 miles if I am on the interstate. I try to stay at 70 mph, but it does it worse at that speed, but if I speed up to 80 mph it does not do it as bad. When it dies you can throw it in neutral and start...

I have been reading threads all over the internet (yes even from other forums) and I am winding up with possibly multiple culprits. Here are my issues/symptoms: (Father-in-law's Truck) 2003 F-350 Automatic Tranny 110,000 miles 1/2 Tank of fuel F-I-L just changed fuel filter 1 month/400 miles...

All, hope you can help. I've read through all the other posts, websites, you tube videos, etc and need some help. I have a 2006 Ford F350 King ranch dually. It has 86,000 miles on it.. Last year I replaced the Oil cooler, Bulletproof EGR (bulletproof Diesel) ARP Head studs/gaskets, Dummy plug...