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Truck just started doing this tonight. I ran the truck about all day pulling a trailer, truck ran fine. Then tonight once I got home I hooked on my snow plow to changed oil in it. Trucked idled 10 mins while I messed around with the plow, then when I went to unhook it, I noticed the rpms would go way down then back up to 1200ish. It kept doing that until I shut the truck off.
When the rpms go up and down it does it slowly, its not like a lope idle. I didn't have time to check anything out tonight, but any ideas what would cause this? truck ran great all day.
Were you getting a SES light, or have any codes stored?
Depending on temps, the PCM does command a high idle and once parameters are met it will return to normal, you should have been able to overcome that though by tapping the brake or accelerator pedal. Definitely an interesting issue.
Were you getting a SES light, or have any codes stored?
Depending on temps, the PCM does command a high idle and once parameters are met it will return to normal, you should have been able to overcome that though by tapping the brake or accelerator pedal. Definitely an interesting issue.
No SES light, I'll check codes today. I tapped the brake pedal when I took the truck out of park, didn't change a thing.
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