I can let my car warm up and it will go from 2k to about 1100rpms and stay there.

If I touch the throttle a little it will idle at about 1800rpms and stay there.

and if i drive it for about 5 minutes after i let it warm up it will idle at about 1800 and drop to about 1k then back to 1800rpms

So what could it be?

b18 is in my crx

 

adjust your idle...screw on the tb...also check timing,tps voltage...i have the same problem when the seasons change i just adjust it and im good

 

are you using the proper throttle cable?

 

if he wasnt then it would be stuck at 1800...ohh if you have that disk thing on your tb try unpluging that mine kepped my tb open all the time...