need help quick 02 excursion

[fine an u]

hey gang new guy here i have a 02 x with 94k on it just installed 4 inch turbo back exhaust and superchips micro tuner set on towsafe. at low throttle i here alot of air and loss of power when i stand on it engine shudders and acts like its missing starts up fine idles fine cleaned back pressure tube alittle dirty no fix could it possibly be cps sensor even though it does not actually stall kicks code 1211 fuel and air metering. great site any help is appriciated

 

[bushpilot]

exhaust leak ? (if it were a 6.0L id
say it was the VGT)

 

[95_stroker]

P1211 ICP Not Controllable - Pressure Above/Below Desired.

Sounds like you are running out of HPO when you stand on it.

 

[Sledpuller]

Check your oil level, It doesn't take much being low to start acting funny. If too low it won't start at all. Just my thought. Is the engine light on? If you put on a new down pipe did you make sure it was sealed up good to the turbo? I'm just thinking from when I did both mods you have now. If you already past me than I'm sorry. Just thinking and trying to help.