P0638 throttle body actuator code how to find the real problem to save money

What is your question?

Check in gin light comes on lose of power the problem comes and goes I've heard that most likely it isn't the throttle body but something related to it wiring,other snsors

What makes this problem better or worse?

When it is hot

How long has your 2006 Saab 9-3 had this problem?

Month or so