Originally Posted by k.blakeley
You dont need another IAC just clean yours...getting another is about as smart as buying a new car once your oil is dirty.
That may be true if it is just dirty, but making a generic blanket statement is just as stupid. I've had two bad IAC valves and in both cases the symptoms remained or worsened after cleaning. They DO go bad and they are not expensive.
The alternator could be bad, or maybe not. At a low idle it is feasible that it would come on, telling you that it is not putting out sufficient amperage. The two things may or may not be related. My advise is fix what you KNOW is bad first...