I'm currently getting code 52 and 25. I got my head milled with regind cams and run on 93 gas. Could this be causing this problem? I just put a stock TB on and my idle is fine. Its goes up and down with the cams but nothing major. I've never got code 52. Could this be from bad plugs? When my friend looked at them he told me the wre lean as hell. I also says intake leak but I just changed all the gaskets. Any advice would help.