Could ThiS Be The Problem or Can iT Be Something Else?

I have codes on my 96 Aurora so its not passing emissions.

P0171 System too Lean
P0174 System too Lean
P1350 Ignition Control System
P1375 Ignition Control (IC) Module 24x Reference High Voltage

Other Aurora owners with the same codes posted their problems on the messageboard and as a result found the problem. So my question iS, can I be experiencing the exact same problem they had or can it be something different. I am not a car expert so any information would be great help.

From my research, this is what i came up with

P0171 & P0174
The cause was a bad valve on the intake manifold. The gasket had pulled away from the valve.
source http://www.automotiveforums.com/t404309-lean_condition.html

P1350 & P1375
a short in one of the connectors that plug into the ignition module
source http://www.automotiveforums.com/t242249.html