Quote Originally Posted by seanrg1116 View Post
if it has an atmospheric blow off valve that could cause some of your idle issues but not all, your problems sounds like a vacuum leak;

do you have a boost gauge?

How much vacuum is it producing at idle?
if its less than about 20 on the vac side than start looking for a loose or disconnected vacuum line.
atmospheric bov doesn't matter on a map based vehicle...only maf based vehicles. map based only sees what's after the tb/map sensor. any leaks after that will cause issues.

1. check the vac lines...any cracks in any of them, including pcv will cause idle surge.
2. any cel? the ecu was from another tuned car, but not this one and you have a y7. unless you did the 2 wire iacv conversion you will have a bad idle.
3. the tune is different and can be causing this as well, but i would check the aforementioned items first.