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Question (Category: Ford)
why would my 99 ford van 5.4 idle up to 1800rpms after it comes out of drive mode and into park - does this sound like to computer
Info Request
Ok you may have a problem with the idle air control valve. You can try tapping on the valve or disconnecting it to see if the idle goes to normal. graphic
Info Request
The PCM will pulse the valve for idle control. This percentage can eb checked with a scan tool that can read pids or live data. I would have this checked before replacing the PCM.

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