I tried looking for info on this, but I couldn't find anything.

Whenever I start my Turbo II in the morning, or even when it has been sitting for awhile, my RPM stays around 2000 for 3 seconds then holds at 1500. After a minute or less, the idle starts pulsing, it stays between 1500 and 2000. The car will do this for the next 5 to 10 minutes unless I'm on the throttle.
It also does this after a mountain run, when the car cools down.

I'm new to rotary, I don't know a much about them. Someone said it might be the coolant sensors warming up the car.

I'll post a video today when I get back from class, around 4pm.
The help is much appreciated.

 

The high idle is normal. The pulsing is not. Probably a TPS out of adjustment or a vacuum leak.

When you start the car it is supposed to fly up to 3K for a few seconds (often this is broken, and don't bother fixing it if it is) and then sit around 1500 RPM. As the car warms up, the 1500RPM gradually drops to the proper idle speed of 750 RPM.

 

How would I fix this problem?

 

If im not mistaking its the oil pressure dropping... cause i always wondered what it was too but a friend of mine told me his does it too and its the oil pressure dropping, i could be wrong though

 

adjust TPS.

If it's an S4, you may get lucky, and be able to adjust it.

If it's an S5, chances are your full range TPS sensor is busted. Best way to get that fixed is buy a new one. Adjustment only slightly helps in this case.

If you have an S5, does your car buck at very light throttle/low rpms?