Im new to this forum and to the tuner stuff. I have a 2004 wrx completely stock. But about a month ago I had to have the top end rebuilt due to my idler pulley seized up and snapped while going75 on the freeway. Ever since I got it back (just barely) I have a loud knocking noise now. Im not sure what it could be! Anyone have a clue? Plus I I have a code for a small evap leak. Thank you