I was recently tuning my car and after completing some 3rd gear pulls I noticed my AFR correction was at -25% at idle. My AFR corrections are usually within 5%, so I am trying to figure out what changed.
At first I thought my O2 sensor was shot, but my wideband matched the O2 sensor. This sounds like a boost leak, but I thought that they usually caused the car to run lean instead of rich.
Any ideas would be greatly appreciated.