what simple things cause a car to run rich. no explanations required.and can a bad cts cause this prob? like i said you dont need to spend much time here i know its been covered i just wanted it layed out simple. thanks alot guys...

 

Oxygen sensor.

 

Yes, a bad CTS could make you run rich, if the CTS is bad, it usually always thinks the car is either warm or cold... if it thinks the car is cold, it would tell the ECM that the car is cold, and give it more gas, to keep it running... since a cold engine usually needs more gas to run alright.

Otherwise, Leaky injectors, or bad 02 sensor. Or if your maf is bad and reading high all the time, but I think you'd have drivability problems then.