After Toyota replaced the engine on my 2022 Tundra under recall, the truck developed serious issues that were not present before. The engine and powertrain system now knock, shake, stutter, and in multiple instances, the vehicle has shut off completelya”including while driving and while stopped at intersections. These failures pose a significant safety risk to myself and others. Sudden loss of power in traffic or while braking has created close calls, especially when other vehicles are nearby. I no longer feel safe driving it. I have taken the truck to the Toyota dealership six times. They claim they cannot replicate the problem, but the symptoms return every time shortly after I leave. So far, the problem has not been confirmed by the dealer or any third party, but the issue is persistent and serious. The truck has only been inspected by the Toyota dealership. No inspections have been done by police, insurance, or other agencies. There are no warning lights or dashboard messages before or during these events. The symptoms began shortly after the engine was replaced and continue today. The vehicle is available for inspection if needed. Toyota has not resolved the issue, and I am concerned other owners who had the same recall engine replacement may be experiencing similar problems. Iam filing this to report a potential safety defect and ask NHTSA to investigate.