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Rolling idle is set by something changing the torque request.
See it a lot more with tuned trucks than stock ones. Try turning the A/C or defrost off. It may be the clutch kicking on and off if the idle isn't changing a lot that may e what is going on.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.