I got my S/C back and man what a difference. Full boost now, but after driving for about 75 mile my CEL came on with error code:

P0171: The Fuel System for Bank 1 was too lean (cylinder #1)
P0174: The Fuel System for Bank 2 was too lean (cylinder #2)

I messed with so many vacum line I was thinking it might be a vacum leak but on my boost guage at constant throttle I get a constant vacum reading. I would thing that if it was a leak that the reading woudl flucuate.

Also since the truck is approching 25k miles I'm going to go ahead and change the Fuel filter, clean the MAF sensor.

Anything else you guys would check, I cleared the codes and drove another 50 mile and the code did not return. I was just cruising along when the code popped up at about 1800 RPM so I wasn't into the S/C

 

What tune do you have in it?

 

Stock Roush until I get my Troyer tunes

 

https://www.f150online.com/forums/sh...d.php?t=253465
I Had similar problems read this thread I would only have trouble with the TP tune loaded replaced the O'2s been perfect since.
Troyer said cheap O'2s from factory

 

I'm still getting the damn codes after changing the fuel filter and checking for vacum leaks. The code only appear at idle. I had the truck sitting at idle and the truck jsut died. After I restarted the truck the codes were there. Every other time the codes appear I'm stoped ant an intersection or a red light. It's almost liek the truck is starved for fuel when Idleing. Any thoughts?

 

After looking at it again lastnight I figured where the damn vacume leak was coming from. The vacum fitting on the vapor management valve was cracked alllowing it to suck air. Amazing thing after i sealed it up the it stopped runnign lean no more damn error code

 

glad you werre able to find the source of your problem. Enjoy your SC, I know I amenjoying mine.