Bogs for a second and then takes off

[XfireZ51]

Marc,

Interesting observations. Let me suggest you try the AC O2 sensor at some point. My experience and that of some others suggests it's more consistent and reliable. I have used the Bosch for a long time but more recently have found that for some reason performance deteriorates over time.
I wonder if the use of headers, creating a longer travel path for the exhaust, affects the accuracy of the Bosch.

Some questions:

1. Has your experience been w both exhaust setups or just the stock manifolds?
2.Is it coincidence that the "defective" sensor seems to be the one I have a harness extension on?
3.O2 voltage is small and the extra resistance doesn't work well w the signal from the Bosch??
4. If you still have the logs of those scans, what is the PW when you see the AFR spiking lean?
I'm assuming you're zeroing out the secondary injector delay on your secondary delete calibration.