after installing the injen CAI and exhaust my idle is a little messed up. The ingine will idle normal for about 30 seconds then drop a few hundred rpms for a few seconds like it is going to stall. Then it will return to normal for another 30 seconds and it keeps repeating this cycle. Any thoughts?

 

I have the Injen CAI and my Z runs great. Did you re-connect the mass airflow meter?

 

i guess you should check for any leaking or install problems...uninstall and reinstall everything properly and see if this still happens

 

I had the same problem with mine so I made it a short ram. I don't see how that would make a difference because it doesn't change any of the hoses that connect it.