I got these codes after I replaced my valve cover gaskets. I hear a little noise coming from near the throttle body. I didnt have a check engine light before I disconnected the throttle body. I also changed the throttle body gasket. Things that i noticed are the air filter hose has some cracks (i dont that is the cause) and there is light carbon build up in the throttle body. Does anyone have some experience with this situation or tips? Thanks in advance.