Hey guys I've had this problem for about two weeks now. When I start my car cold, it starts up fine and idles fine. But when the engine is warm/hot and I go to start it up, it starts fine, but it doesn't hold idle and dies. I have to try it again and give it a little gas to stay running. The funny thing is, this never happened until my ecu got reset when my battery died. Also, I recently switched out my fully catless exhaust back to stock prior to my battery dying. I changed my spark plugs today too and cleaned my MAF sensor to eliminate a CEL I had come on two days ago. Anyone have any idea what this may be, or have had a similar problem? I've read that it could be a vacuum leak, others say it could be a bad PCV valve, and some told me I just need a tune. Any help would be greatly appreciated. Thanks guys!

 

I would assume its a idle relearn issue you are having although with subies that I have worked on, it never really did that or you really messed up the the maf by cleaning it instead of replacing it.