I'll second Doc.
fuel pressure test time, sounds like a bad warm up regulator but, with out checking system and control pressures through the warm up range and hot co/duty cycle readings you're throwing parts at it.
Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.