I've had the car about 2 weeks now and can't seem to figure out what's causing the code. It says fuel system lean 1/1 . As I'm driving , sometimes it feels like it's stalling out/losing power. Any ideas or suggestions? Need to fix it asap.

 

https://www.obd-codes.com/p0171

 

3.6L engine?

check the long term and short term fuel trim readings with a scan tool on both banks if v6

check the fuel trim readings at idle and engine rpm held at 2500 and report back