Car dying after cold air intake, if we close off half airflow it stays at an idle

With respect: what on earth are you trying to accomplish by adding a "cold air intake" to this vehicle?! Restore the vehicle to factory condition and you will have no further issue.

I could not agree more!! Do yourself a favor and remove that gadget and replace the stock assembly - hopefully you can return the “cold air intake” thing. These things are simply a sales gimmick and have been DYNO proven not to increase performance or mpg - in fact just the opposite typically occurs.