I would assume that you don't have an OBDII Scan Tool. That being the case, stop in at Autozone or Pep Boys...they can pull the codes for you and let you know what the fault is. Or...swing by the dealer.
Tim
Check Ray Skillman Ford in Greenwood, IN. I bought two Roush Mustangs from them over the years, and they stayed pretty much in line with the Roush cost. Little bit of a mark-up...not too bad.
Tim
Do it! Cams in the car are totally worth it. I have them in all of my cars. Had a similar incident happen to me at a stop light, when some dips**t backed into me. We turned into a parking lot and called the police. When the police arrived he claimed to them that I ran into him. I simply...