Did you follow all of the diagnostic checks in the related OBD2 code sheets? If not, you really didn't fully diagnose the problem. The code sheets, if adhered to, should bring you to the root of the problem. If there are things you cannot do, ask questions about those steps specifically and we'll see if we can walk you through it.

Also worth mentioning is that a fuel leak internal to the intake could cause a rich mixture code. A fuel pressure and leak down test show you if there is a leak. Just follow the steps detailed in the link found in my signature below.

Replacing the component(s) called out in the title of the particular OBD2 trouble code(s) does not always solve the problem. In my experience, it rarely solves the problem, but then again, I usually get to work on vehicles after the simple stuff hasn't worked for the owners.