92 civic cx with 97 jdm type r . ive had it for a wile.i did the swap myself and got it from a friend who had the swap in his carand was having the same problem in his car also. i replaced the idle air control motor 2 times thats not the problem. tryed different ecu's .. i dont think its a vacuum issue its not surging up and down just goes to around 3000 and stays there..i had a 97 gsr motor in it before the type r with no idle problems. so at a stop the car idles perfect , when i start to drive it jumps up to about 3000rpm.. when i come to a complete stop it returns to perfect idle... but when it idles at a stop it makes a humming noise (low) from my intake.. i know a decent amount about motor swaps and so do alot of my friends but we are baffled.. if anyone can help let me know...

thanks..

jdm type r , and type r ecu with obd1 to obd2 pig tail..