How do you fix a low idle problem on a ford explorer?

If you have a cable operated throttle body it's probably a bad idle control. Depending on your parts supplier they might call the idle control an IAC or ISC or IBP. If you replace the idle control, you should first clean the inside of the throttle body thoroughly using throttle plate cleaner and either a soft brush or a rag, then run the engine for a few minutes.

If you have an electronically controlled throttle body, suspect a damaged throttle body or a broken wire near the connector at the throttle body.