What would make my 2006 Toyota Sequoia idle rough, loose voltage, and die?

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! It sounds like your 2006 Toyota Sequoia could be experiencing a fuel delivery issue or a problem with the air intake system. A clogged fuel filter, a failing fuel pump, or a dirty mass airflow sensor could cause rough idling and loss of power. Additionally, check the throttle body for any buildup that could restrict airflow. Since you’ve already replaced the battery and alternator, focusing on fuel and air delivery systems would be a good next step. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554!