i am starting a new thread. the other one is getting too long and also digressive. 1. engine diagnotic codes for 1/6 are 4114 and 1111 and then they repeat and repeat. 4114 is Top Dead Center control. 1111 is hot wire airflow. 2. codes for 7/12 are 1211 and 1121 and then they also repeat. 1211 is lamda regulation. 1121 is rpm sensor. 3. i will look at the air flow meters first since they are easy access 4. i will also order a set of NGK DCPR9EIX, if the Rifle driver approves. The Champion A-GC6s were installed at engine out service 1500 miles past (in 2008). I have not had good luck with Champion in the past and these plugs are out of date anyway. i usually try to put a bosch plug in if it is a bosch ignition which the M is.