it idles quickly to save as much fuel, energy, oil, etc. as possible
It depends on how long you are idling, or how fast you are going. If you know you are going to be idling for a long time, it's best just to put your car in park.
maybe the carburator I had this problem on my 97 lincoln town car, turned out to be s crack in my intake manifold. once it was fixed..no problem.
Possibly due to engine mount
When you put your car in park and it idol fast constantly what is wrong with it
I would suspect the park pawl gear is broken.
Idling too low or a bad lock-up torque converter solenoid.
"0" mph.
put it on gear 6
putting it on gear 6
it means the motore is rotating faster a dead stop than it should be.
Maybe car is in park.
idling too fast - adjust choke