2011 Chevy Malibu 2.4L P0171 Code: System Too Lean - Diagnosis and Solutions

I'm experiencing a persistent P0171 'System Too Lean' fault code on my 2011 Chevrolet Malibu with the 2.4L engine. Despite cleaning the Mass Air Flow (MAF) sensor, checking for fuel leaks or cracks, inspecting injectors, and replacing both oxygen sensors, the code continues to appear intermittently. Fuel economy has remained stable—no noticeable changes in miles per gallon—and there are no significant performance issues overall. The only symptom is occasional hesitation, which occurs most noticeably during sudden maneuvers such as lane changes or entering roundabouts. This lack of power at critical moments is particularly frustrating. What specific components should I check next to resolve this lean condition? Any real-world troubleshooting tips for P0171 on a 2011 Malibu 2.4L would be greatly appreciated.