C-15 Surging

2006 Peterbilt C-15 acert Cat
Did a complete serviced on the truck this past weekend. Blew out air filters,changed oil filter and oil and changed the clear filter and the cannister fuel filter. Monday when I left the yard when i got to 7th gear it started dying out then picking back up. I thought i had a little air in system from changing both fuel filters. It quit surging about a mile down the road. Got about a 100 miles away and it did it again. Got to my destination and let it idle the whole time with no problems. Tightened the fuel filter a little and thought that had it. Left to come back home and it does it again. Get home today and tightened up filters, then took them off and cleaned and finally went back and got 2 new ones and installed. Still does the same thing. No skip and idels fine but when you get about 30 mph it will die and then pick back up. When it dies its at about 1400 rpms. It will drop about 3 to 4 hundred then pick back up. When its doing good you can shift gears and it will slowly accerate but if you shift while its down on power it will cut off. It has done this twice and i have to use ether to crank. When i crack the cannister filter it has alot of pressure on it and the clear one has fuel showing in it.
Any help?? gonna have a guy hook a pressure guage to pump tomorrow and see what it says

 

We did not use it but have been told to check it for trash. We took it off and cleaned it even tho there was no evidence of trash and reinstalled.
Thanks for the info

 

yes. it was working fine until we serviced. We have checked and cleaned everything and replaced the filters and the problem is the same. We are going to check the fuel pump pressure this morning. Will post back and let ya know what it shows