This is on my parents truck. It is a 2008 4.0 with 36k miles and a TRD supercharger. I installed the supercharger 26 days and 750 miles ago and it hasn't had a problem, but on friday when it was started the light came on and even when it was warm it was idling at 1200 and fluctuating between 1600 and 1200 like somebody was tapping the petal.
P0171:System too Lean (Bank 1)
P0174:System too Lean (Bank 2)
I had it reflashed the day I installed it. Anybody have any ideas what to check or replace? I can interchange parts with my truck if needed.
EDIT: I already cleaned the MAF and checked for leaks, so im at a loss.