What code will a malfunctioning throttle body throw

Hello, the P0638 indicates a throttle actuator concern, but P0105 indicates manifold absolute pressure issues. I'd be looking for an air intake issue first to see if you have a lot of unexpected air getting into the intake manifold. If you clear codes, what comes right back? Getting professional testing from a technician equipped with a diagnostic tool is a really good idea. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops