No boost......no power

[Roysbigtoys]

I got my new CAC installed today. Pressurized the system ( after the turbo ), made sure I had didn't have any leaks. I took it for test drive and still low boost, less than 20 lbs. While driving I had a code 2973 ( Intake Manifold 1 Pressure - Data erratic, intermittent, or incorrect ). Came back to shop and got on my phone to see what I kind of help I could find. I read that you can cycle the key switch, which I did and the code went away. Test drove it again, no code and still low boost.

So far this is a list of what I have replaced:
New IMAP sensor and pig tail
New exhaust back pressure sensor
New Paccar CAC
Up dated file/tune from Rawze

I also did the following:
When I originally de-mandated the truck I left about an inch around the outside of the DPF and installed stainless steel bolt, nuts and washers in the venturi tube. So now I have completely hollowed the DPF out. I also fabricated and installed a blocking plate for the rear of the EGR cooler.
Arrrrgh......what am I missing?