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1997 - 2003 Ford F150 General discussion on the Ford 1997 - 2003 F150 truck.

Idle fluctuating in park

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Old 12-22-2016, 12:56 AM
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Default Idle fluctuating in park

Hi everyone

I have a 2001 F-150 with the 5.4. The rpms have been fluctuating quite a bit lately when I am in park and only park. Once I shift into reverse, neutral, or drive it goes away.

It fluctuates quite a bit, sometimes up to 350 rpms.

I'm just wondering what might be causing this.

Thank you
Old 12-22-2016, 06:20 AM
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Iac valve
Old 12-22-2016, 06:43 AM
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That's my guess




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