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Can you keep it running if you keep you foot on the gas pedal?What engine does your 2004 Explorer have?What have you done to try to fix this problem?
Try this first before replacing any parts. Remove the throttle body and use throttle body cleaner or something similar and then reinstall it. Then disconnect the battery for 15 minutes and then reconnect it. Then drive the vehicle and see if the idle concern returns. The throttle body is electronic with no throttle cable, and over time, deposits build up in the throttle body and cause it to stick and stop air flow into the engine at times.
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