Thanks for the suggestions. I drove the car after the secret handshake method told me it was a 77 and the light went out. The check engine light is on still but I haven't had a chance to drive the car much since. I'll put some miles on it this weekend and I hope the CEL light goes out too. If not I'll take into consideration the idea of taking it back to the shop it came from and asking them to follow up with these suggestions. I'll update if I find out more.
What is the rpm supposed to be at 70 mph? 2002 2.5 TS