Toyota Repair: Toyota Celica Idle, toyota celica gt, air control valve

Question
I own a 1993 Toyota Celica Gt and it idles low, sometimes really low. When i stop at a light it vibrates a lot and will sometimes stall. I don't understand because it is an automatic. What is wrong with it?

Answer
Most of tyhe time this is caused by a sticking idle air control valve, it can be remedied by removing the throttle body from the intake and then removing the IAC valve from the throttle body, then both parts should be cleaned on the inside to remove the carbon deposits and reassembled and reinstalled.