high intermittent idle is not a problem it is idling up to keep fan running at right speed to keep engine at correct temp
That is if it's hot.
Please state more information on your engine and what you've done to troubleshoot the problem so far. Mine does this too, maybe a Ford characteristic?
Ok had this problem too and wonder if this is the problem with all the Toyota's too.
1996 2wd manual 4.0 would race to 3000 rpm and randomly the engine would quit. the check engine light came on and i checked it with an obd 2 scanner. came up with p1307 engine idle control undesired engine speed. went to auto zone and purchased part number ac473 engine idle control valve for about 50.00. replaced valve on top of engine on driver side in about three minutes. problem was corrected and no more problems. just wanted to help because i have learned so much from others on the Internet about car repairs. thanks Gary Day.