Intermittent code 559

[Heavyhaulmark]

I'm having an intermittent code 559 over the last month. The enigine derates for several seconds, then power returns. This can occur multiple times simultaneously, or it can go hours or even days without occurring. On really cold days it will idle fine to warm the truck up, but once you attempt to move the truck, the code comes on and the truck, will slowly sputter and die this occurs both loaded or bobtail. Once the lift pump is cycled, it will start back up, run fine, code comes on, then it starves for fuel again, and shuts down. All fuel pressure tests check perfect. It will not replicate the code issue in the shop while connected to insite.

Recent parts changes in the last 3 weeks: Fuel Filters, davco system housing, fuel pressure relief valve, lift pump, fuel actuator on pump, fuel rail pressure sensor.

Parts in the last year:
Full set of Injectors, high pressure pump, gear pump, all hard fuel lines. ECM, engine harness.