well i got a CEL today, its that damn p0171...idk why i got it, my mods r GMPP CAI, 2.0 header, and 2.0 DP...i got on the code scanner and pulled all this from it:

note: i took the info at iddle

throttle position: 18.8%
engien RPM: 822
air flow rate: 2.73gr/sec
Map sensor: 27
ambient tempature: 78f
intake tempature: 89f
ignition timing advance: 4.5degrees
short term fuel trim1: 5.4%
song term fuel trim3:1 8.7
short term fuel trim3: 32.8
long term fuel trim3: 32.8
vehicle speed: 0mph
absolute load value: 14%
fuel system 1: clsd
relative throttle position: 6.2%
command throttle actuator control: 6.6%
absolute throttle position b: 18.8%
accelaration pedal position b: 18.4%
accelaration pedal position e: 9%
command EVAP purge: 12.9%
command equivalence ration: .999
fuel level input: 55.6
control module voltage: 13.22v

also for some reason when i turn the code off...it only comes back after idling for a while, never when i am running the car...