Ok here's the deal. I bought a car that has been sitting for a while. I got it all put back together and now I am having a problem with the idle.

1. When I start the car cold, it revs high at around 2000rpm.
2. After the car gets to temp the idle jumps from 1000-2000rpm.

I was thinking that it could be a EGR valve or a vacum leak but I was thrown off when I turned on the AC.

3. When the AC is on, it idles steady and fine at 1000rpm.

I have already reset the ECU and nothing helped there.

Sorry if this is a dumb question. Any info is much appreciated.