Reduced Engine Power with codes P2101 and p1516

[mrcrash]

2008 Chevy Silverado 1500 5.3L 4x4

Firstly any help would be highly appreciated.  I took my truck into the shop 2 days ago with A "Reduced Engine Power" and codes P0174(fuel mixture imbalance) and P0171(fuel trim system lean bank 1)  The mechanic was able to find a hose that became disconnected.  Codes went away and the truck drove great for one day then I got another "Reduced Engine Power" this time with codes P2101(throttle actuator position performance) and P1516(throttle actuator control module/throttle actuator position performance).  The throttle body is still new, I checked and its still shiney and clean.  MAF and PPS is new.  Does anyone have any ideas as to what is wrong?  Is it related to the P0174 and P0171 i had before?  Again any help I would be greatful for.  The shop is closed and i need to get this thing running for work monday.