2007 Dodge Charger 2.7L V6 - P0201-P0205 and P0264: Injector Circuit Open in All Cylinders

My 2007 Dodge Charger with a 2.7L V6 engine is currently throwing diagnostic codes P0201 through P0205 and P0264, indicating injector circuit open faults across all cylinders. After previously experiencing a hole in the top bleeder valve housing (which I replaced with a metal housing), the issue has persisted. The engine now exhibits severe misfires, with the check engine light flashing continuously. It shakes noticeably at idle, maintaining an RPM range of 800 to 1000, and lacks power when accelerating—no 'get-up-and-go' response under load. I've already replaced all spark plugs and coils, and after removing the intake manifold, I inspected the wiring harnesses and found potential issues with the right-side injectors. The problem appears to be related to wiring or injector connections. This has been a month-long ordeal—after purchasing the car, I paid off the loan just two days ago. I'm seeking advice on how to properly diagnose and fix this issue, especially given that all cylinders are affected by open circuit faults.