NightRider2000

I just installed the bbk intake which was costly and a pain in the ***. I am thinking this problem has something to do with the computer or my tune. The car starts up and idles a little high 200 rpms more than it should and when you give some throttle it sticks and stays for a few seconds than gradually comes back to it's new idle. Also after staying idle for a minute it automatically boosts the idle to 2000 and holds and comes back down by itself and continues idleing for another minute until recycles this step. What exactly is the computer doing? I don't see how this could be a vacuum leak.