texjpr

So my 2013 JK is stalling and surging. If I am sitting at a light it will occasionally die, it also happens sometimes when I am backing up. Then it will loose power sometimes and surge. Now I have noticed that when it does this it is when the Jeep is either at idle or close to it (under 1500 rpm. Has anyone had this happen? For the first couple of months while it was doing this the CEL wasn't on but now it is and the code is a p0256, which according to my Matco code reader is a catalyst code. Any help on this would be appreciated.