Hooked this hot mess up and took off for OK for the big race. I had the pace again, but came up short on luck. 2 missed shifts ****** me hard for the podium in the final, I missed it by 1. Truck ran great for the first 200 miles, then started rolling coal again. It got worse, then better with throttle position. To me, this pointed to an O2 sensor even though I lacked data as it implied that open loop was good and closed loop bad. The reason I had no issues in CO was because throttle position here forces a downshift and open loop vs airflow much sooner than at a lower elevation. What happens is that, at a given throttle angle, much more airflow happens at a lower elevation than does a higher elevation. Also, a narrowband is more easily overrun than a wideband WRT airflow, this is part of why they read so much more accurately and also why I never rolled coal foot to the floor. Onto the next fuel/ignition issue.
