Recently, I was driving and i lost power and speed control, I pulled over and turned my car off waited a little and then turned it back on and it ran fine. Then the CEL came on. I took it to my shop where they said the codes they ran were a throttle body and engine speed sensor. I decided to do them with my uncle who's a mechanic and we replaced them and the throttle body code keeps coming up, naturally I thought it was a defective part and got a new one and replaced it again. Now the code is still coming up and I don't know why. any thoughts?? my car is a 2004 Audi a4 Quattro 1.8t. Any thoughts of why this is happening