Reader Question: I have a 2001 Ford Taurus that is having problems idling and when I put on the brakes, it stops but it does not feel normal. When I pulled into the garage I let off of the gas and the lights went dim it still idled but it wasn’t idling correctly.
Do you think it is the alternator?
Please help me.
I would ask your mechanic to inspect and clean the throttle body and the idle speed control motor. Those items get dirty and routinely need to be cleaned out.
It is a simple and inexpensive repair and should be part of maintenance regardless if it corrects this particular issue or not. It is the first place I would look.
Here is a picture of a typical throttle body with the fresh air hose from the air cleaner removed.