Idle going up and down...

Old 10-17-20, 03:30 AM
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Idle going up and down...

I have a 2002 Ford F-350 5.4, put new plugs and all new coil packs in it last year and it ran fine. I'm getting it ready for plowing season this winter and I notice when I let the truck idle I can hear the engines RPM's go up and down, any ideas what could be wrong?
Old 10-17-20, 04:28 AM
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Clean or replace the idle air control valve on the throttle body.
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