NISSAN MAXIMA TROUBLE CODE

I Keep Getting P1136 Code That Won't Go Out And I Changed Bank 1 And 2 Intake Valve Timing Back 2 And P0452 Pressure E Evap Code.

My Car Is Showing Codes P0300 Random Misfire P0171 And P0174 (fuel Trim Bank 1 And Bank 2 Mixture Too Lean) I Know What The P0300 Code Is (...