Engine slow to idle down, should I try and fix?

_Kodiak_

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2001 F23A1 A/T, engine is slow to idle down when you let off the throttle. Takes a couple seconds to completely return to idle speed. Should I be concerned by this or is it just a characteristic of the engine?

Also, side question about throttle range. I've got an OBDII bluetooth adapter for my phone and using the Torque Pro app, my throttle maxes out at about 90% both via pedal and manually pushing the throttle cam under the hood. I'm thinking it's just a bug in the app, so it's not super concerning. Anything I can look at for it?
 
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