the idle should be about 900 RPM in park or neutral.
when stopped at red light or when in park
Park Reverse Neutral Drive Super Braking
check your timing & up your idle a little
Check the Park Avenue EGR valve for a clog. A clogged valve can cause a rough idle and stall at a light.
A vacuum leak (Brake booster).
Normally when you park it isn't moving therefore 0
Park on a transmission is a gear that allows the transmission to idle as if its in neutral while locking the drive train to prevent the vehicle from rolling.
It is normal for the RPM to increase a little when put in park or neutral. If the RPM increases by a lot, then you need to adjust your idle speed.
No load in park or neutral 700 give or take 50rpm With A/C around 800rpm
Could be a very dirty fuel filter.
It shouldn't idle that high the factory idle setting is around 900 RPM's check to make sure nothing is sticking and check vacuum lines. Good luck fixing your problem.