1985 Honda Prelude 1.8 duel carb loads up when first stated and then clears and idles at 3000 rpm.

I changed the thermostat and bled the cooling system.Still no change. Im just wondering before I take it to be repaired if there is anything else i should try changing. I also sprayed ether around the vacuum lines and didnt find a leak. The idle speed is still at 3000-3500 after its warmed up.Is it just a matter of turning the idle down or what are you ideas on this situation. Thanks for any info you can give me.