Car: 2015 Chevy Malibu 2LT w/ 2.5L
CEL Codes: P0171/P0420
Odo:146k

Bought the car couple weeks ago while visiting family, and drove it 1300 miles back home with no issues. Couple days later, CEL came on along with my front left tires tire pressure sensor going out simultaneously. First day, there was no decrease in power, stalling, or odors so I assumed it wasn't anything serious. Second day, I checked for vacuum leaks, and there was none I could find. Cleaned the MAF sensor, and 02 sensors. Then I flashed the code and took it on a drive to trip the drive cycle. Came to a stop sign during the drive, and stalled out. On the instrument cluster, "Service Stabiltrak" flashed before completely stalling out, and I had to turn the car off and on to get going again. The same CEL codes came back on, and I scurried home with weak low gear acceleration, and a couple more stalls during stops.

Any suggestions before I buy a new fuel pump and pray?

 

Yes. Measure fuel pressure.
Read fuel trims in live data.
https://www.obd-codes.com/p0171