Check engine and Tc light on car running rough?
Check engine light and Tc light come on when starting,in park and neutral car wants to cut of engine power is
reduced,in reverse and drive it goes to a normal idle?
Since the CEL light is on, you can pull the codes to find out why. a local auto parts store will sometimes do it for free, post back with the 4 digit code and we can help futher.
thanks will do now
Throttle position sensor?
Looking for a Used STS in your area?
CarGurus has 924 nationwide STS listings starting at $2,500.
Search Cadillac STS Questions
Cadillac STS Experts