My car has been idling pretty high lately.. Close to 2000 when I first start it, and then down to around 1500 throughout the day. I just got home from the grocery store, and parked in the garage. Now, it idles at 1000, then goes up to 1500, down a bit to 1250, back up to 1500 and eventually works its way back down to 1000. If I rev it at all, it goes back through the same process. I also have a CEL, but I have no idea how to read codes or whatever. Nothing has been messed with since the skunk2 IM, and that was back in March. I did throw on an AEM CAI a month or so ago, but, like I said, nothing has been done between when the car was running fine, and when it started this. Any help would be greatly appreciated. Thanks

 

Search here or the web on how to pull the code. Simple.
As for the vacuum leak, make sure all the bolts/nuts are tightened down to spec on the IM. Bla bla bla

 

spray brake parts cleaner on your vacuum lines with the car on. if theres a leak, the vacuum from the leak will suck it in and the car with idle like shit for a sec.

 

The thing is.. the car has run perfectly since the IM was put on. I did put a new CAI on it, but that shouldn't affect anything to do with a possible vacuum leak - should it?