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It has a P062b,P0300 codes
- Fuel pressure is fine
- 2014 Chevy impala Limited 3.6 vvt direct injection
- 135,000
- on hills it would start stalling and then the check engine light would start flashing and soon after it would surge
- i got stranded on the side of the road and now it dies when I accelerate
The P062B code is likely pointing you in the direction of the fault. You can find troubleshooting information online, for example:
https://www.obd-codes.com/p062b
https://www.ecufiles.com/obd-codes/p062b-internal-control-module-fuel-injector-control-performance/
https://www.2carpros.com/questions/obii-code-and-possible-solution
A dealer-level scan tool may be required for diagnosis.