I have a 2005 5.4 SCREW with 105k miles that's idling rough, bad mileage, shudder at 45mph and no power on hills. I currently have 4 consistent codes, p0012, P0300, p0305, p0307. About 6 months ago I replaced both cam phasers, timing chains and tensioners with Dorman replacements. And it ran perfect. About a month ago I added some Techron Fuel injector cleaner as regular maintence and then it started to act up. I've replaced all 8 plugs, injectors, fuel rail, VCT Solenoids, just replaced COP for #5 with no noticeable difference and still a p0305. I'm running out of money and ideas. Any suggestions?

 

Unfortunately, the Dorman phasers have a history of failing early and without cause. However, some people have had success.
Another possibility is the VCT solenoids. If they are original, they may have failed. You can try unplugging them and letting the engine get up to operating temp. You'll get a code for them, and the engine may not run perfect, but if it runs better and you don't get the misfire codes, then there's a good chance replacing them will get you going.
With the timing components, Ford has revised these parts. Some multiple times. With the phasers and VCT solenoids, oem Motorcraft is the way to go.