truck ran fine when parked after work, next morning drove 3 blocks to the store, left truck running, while walking across parking lot truck chugged a couple of times and died. got it fired up and drove home. put obdII scanner on and got p1316 code. replaced both valve cover gaskets and harnesses. started engine and smokes real bad ,heavy black smoke and diesel smell at idle. now getting p1211 code . any ideas