Intake install, car won't idle now....

[Joe_M]

I put in a CAI this weekend and now the car will not idle correctly.  When I start it up it will shoot up to about 1500 rpms and then just die.  I restart it, and hold the accelerator down and steady the idle to about 1000 and then it will "catch" and stay at around 600.  I don't know what the deal was so I took it all off, and put the stock airbox back in and it is doing the same thing.  All the vacuum lines are hooked back up and there are no leaks, I don't know why it won't idle correctly now.  

Also, when I start it up first thing in the morning it won't fast idle, it will either die, or idle at 600 right off the bat.

I've looked under the hood and visually inspected all the vacuum lines and when I was doing that, it appears that there is no harness connecting into the throttle position sensor on the throttle body.  If this wasn't hooked up, the car should be throwing a code 43, but there isn't a check engine light?  What is going on here?  I am ready to just give up and get another hybrid honda..........  but I love the Nissan too much.  Any suggestions?

Joe