Got 6.0 powerstroke and every now and then as I'm driving it seems like its not getting enough fuel. Pump is good, filters are clean and regulator is clear. Boost level stays the same just bogs down and have the pedal to floor and stays right at 60-65mph. Also stop at stop sign and hesitates when taking off. Any ideas what could be causing this?

 

Possibly sucking air into the fuel system. One of the things to check would be all the suction side fuel lines for any looseness or cracks.