Hi. I have searched everywhere and tried every recommendation I have found on the forums. I have a 2006 Ford F-250 5.4l the symptoms are when it's warm it has half power and it will stall at idle. What I have done with the truck is.
New cam phasers
new chain
new tensioners
new vct solenoids
new oil pump
new plugs
new ignition coils
new stock cam shafts
new rockers
new lash adjusters
new exhaust manifolds both sides
new muffler
oil change with the right oil
ran it with sea foam in the crankcase before oil change
new fuel pump module
new evap vent control
new abs speed sensor
i cleaned throttle body with brake cleaner
Scanned it after a 15 min ride of having to use 2 feet to drive it. The engine codes that came up are p0022 iacv short to ground and p1000 readiness test not complete. I also got p1804 4 wheel drive high indicator circuit failure p1808 4 wheel drive low indicator circuit failure

Not sure what else to try. Any help would be greatly appreciated

 

Based on your error codes, I'd look at the idle air control.

 

Thanks for responding. I was googling that and can't figure out where it is on my truck. My guess is it's part of the throttle body.

 

Vacuum leak or air leak behind MAF sensor

 

this youtube video may help


https://m.youtube.com/watch?v=rNQGEGvophg

 

A 2006 5.4L 3V engine doesn't have an IAC. Those are only on 2V engines.

 

I bought a smoke machine and checked that but I will try again. And I have checked the vacuum line that is on the back drivers side and it is good. I will update after I test it again. Another thing I should add is when I disconnect the vacuum line from the fuel pressure sensor on the fuel rail it's gets better. Does anyone have an idea why that might happen.

 

I show a P0022 as a camshaft VVT error code.

P0022 - "A" Camshaft Position - Timing Over-Retarded (Bank 2)