cmpndbowman

I've only had this happen a couple times so I'm not overly worried about it, but occasionally (like maybe once a month) my car really doesn't want to start. It will turn over and then hover dangerously close to stalling and then rev back up to a normal idle after 30-45 seconds. I only noticed it after I put my cold air intake on so I don't know if that would have anything to with it. It seems to do it very randomly (hot weather cold weather, first thing in the morning, after I've been in a store for just a few minutes). Anyone have any ideas? Sorry so long. Thanks.