hey ur problem sounds like my friends crx when i did his first b16a swap. sometimes there is a cold engine sensor. well its not really a sensor but it is more of a diafram. when the engine is cold it holds the throttle plate a little open for extra air and as the engine warms it closes. it is located right by where the throttle cabel connects to the throttle body. the intake shouldnt matter though. but i would check it out on you engine. good luck though
let me know if you get it fixed