I'm not sure if this is a sensor issue or a controller issue, but my wideband reads normal for the most part then shifts to some odd number. For instance: idle usually hovers around 14.5-15.2 but then occasionally it will lean out as much as 16.7 is what I've seen. I highly doubt it's a power or grounding issue and to prove it, you can read my write up I did. Maybe a fueling problem? Stock pump/FPR with Evo 8 injectors.
It even does it during cruise occasionally so I really don't know what's up.
Suggestions or ideas?