P0148 on blower truck.. Anyone have this issue?

[Canuck714]

Have a new to me 14 with brand new engine, Whipple, 3.25 pulley/Ford racing throttle body big heat exchanger. Assuming a complete stage 2 kit.
Have been getting code P0148 and lean bank 1 and 2 codes. Truck runs and drives fine.
Tried spacers and new downstream O2 sensors, clear the code and after 3-4 drive cycles it will come back. I have checked for possible air/vacuum leaks and dont appear to have any.

Thinking injectors or fuel pump may not always have the right pressure, or may MAF sensor issue?
Anyone else have this issue?

 

[Canuck714]

Nobody ??

 

[MTF]

You say you tried O2 spacers, did you leave them in.
Are you letting the truck idle for long periods of time to deal with the heat with the AC on?

Do you have a way to monitor real time Fuel Trims (short and long)?

I use the Torque Pro app on my Android phone.