I have a 2006 Mustang GT which recently had a throttle body from a GT500 and a cold air intake from C&L installed along with a custom tune from a local performance shop. The car ran great for a day until i had to make a business trip to Salt Lake City and just over half way the car suddenly slows down and the wrench light on the dash comes on and the car does not sound right. I pulled over and restarted the car and it went away but came back about thirty miles later the check engine light came on along with the wrench icon again. I limped my way to Salt Lake to a ford dealership and they told me they cant work on the car until i have my tuner shipped here because of the custom tune it has. If anyone has any idea what is going on i would appreciate the help.