The component that maintains idle speed is called an idle air control valve. It is located on the throttle body. If this isn't working properly, it could cause the engine to stall.
Here is a link that explains how to service one. Take a look through this and see if it is something you could do. If so, when the IAC is off the vehicle, inspect where it mounts for carbon build up and dirt. Also, see if the pintle on it moves a bit when the key is turned on and off. ( you will need a helper to do that)
Here is a link that shows in general how one is replaced:
Now, if you confirm that it isn't working, here are the directions specific to your vehicle for replacement:
1998 Ford Truck Explorer 4WD V6-245 4.0L SOHC VIN E EFI
Removal and Replacement
Vehicle Powertrain Management Fuel Delivery and Air Induction Idle Speed/Throttle Actuator - Electronic Service and Repair Removal and Replacement
REMOVAL AND REPLACEMENT
Typical Idle Air Control Valve
1. Disconnect the Idle Air Control (IAC) valve electrical connector.
2. Remove the IAC valve.
1 Remove the two bolts.
2 Remove the IAC valve.
- Discard the gasket.
NOTE: Install a new IAC valve gasket.
1. Install the idle air control valve.
1 Position the IAC valve.
2 Install the two bolts.
3 Connect the IAC electrical connector.
Let me know if this helps. Also, let me know if the engine has a rough idle at all times.
Images (Click to enlarge)
Friday, October 9th, 2020 AT 12:48 PM