So I have an 05 f150 5.4. Everything has been replaced. Everything. It drives like a dream . 70 or 75 mph runs great but sometimes at low idle the phasers lose oil. And it runs bad. Its got a brand new oil pump. I had the pressure cked. 60 psi at idle. I had to put 15w 40 to drive it it still does it. But not all the time. I slugged it out. It has a ford oil filter. I'm stumped. Any ideas please.

 

Any codes?