I知 running the PV2 with target tune. I have run several auto tune sessions and no matter what I do I continue to see lean spikes in the rear cylinder only. I値l be in steady state cruise, speed and rpm seem to not matter. It may be between 13.9-14.3 then jump to 17+ and back. I have checked that the wb sensors are tight, have no vacuum leaks that I can find. What else could be wrong? Could this be an indication that the OEM plastic manifold is going bad? Mods are:

Jackpot 2/1/2
Reinhart 4.5 slipons ( removed DBX baffles for stock)
ACDC air filter
PV2 With Target Tune.

I have a copy of the tune and ran a log but I don稚 know how to view a log file.

Thanks
@fuelmoto

 

Without seeing the map (rich misfires read lean too) my suggestion would be to switch the sensors cylinder to cylinder and see if it follows the sensor.