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I have a 1992 rs. When I start the car the idle runs at about 1500-1750 rpm on a cold start. It drops to around 750-1000 rpms when the engine finally warms up.
Anyone have any knowledge as to what might be the problem?

p.s. I just bought the car (my first car) and do not know much on auto mechanics (will be going to school for it shortly and will be learning on the mx in the mean time) so please explain in detail, thank you.

Most likely your idle adjustment.

my ,mx3 and mx6 did that too.

For the three years it was in. I wonder how the idle adjustment gets off like that.

I always though it was the ECU doing it....getting the engine to operating temperature and "getting the juices flowing"

also timing can vary idle speeds, including vaccuum leaks, an inproperly torqued intake mani, idle adjustment, and the iac

agree with mazdaman I would check your air mixture screw ( ontop of the TB) an start from there.

I was under the impression that all mx3s will run high until it hits operating temp. After that it should drop to 700(or w/e the factory setting is) and you can adjust that with the idle screw. Get the car up to temp though first.

Yep^^

I would start with the idle screw on the butterfly of the throttle body. check your gap there between the screw and the stop. Then if that is good I would move onto the idle screw on the top of the TB. just take note of how many times you turn it, so you can put it back if that is not the issue.

agree, Start with the "easy" stuff to eliminate out. then go to the hard stuff.