A/F Readings Is This Normal?

[LILJohnSVT]

I had a new NGK plug go bad at the track and my wideband was showing 13.4 to 14.2 at wot my last pass on the track. So i quit running it and limped home with a dead cylinder. Well i found the bad plug which is on the same side as my wideband sensor and changed it. The truck started running normal well the IAC started acting crazy so i replaced it with a ford one. Now if i get on the road and nail it from a roll the wideband reads 12.1 to 12.3 but it climbs as the rpm's do and right at the shift point which is 5,400 its reading 13.2 to 13.5. As soon as it shifts it goes right back to 12.0 or 12.1. Is this due to the hot weather or do i need to bring it back to my tuner? Any suggestions? Thanks Lil John

 

[DXBLIGHTNINGBOY]

i think you should have a summer tune and a winter tune just to be safe

 

[Scuba-Matt]

If your showing 13.4 - 14.2 at WOT you better stay out of the gas until you get it re-tuned.
That is a very lean condition and it can cause catastrophic failure to you engine.