So my car Wide band goes very lean!! Under 2k rpms it will sometimes go all over the place from lean to rich which is normal but once I pass 2k rpms no matter what I do it goes lean enough to were the wideband cant read which is 17:1. I cant go full throttle and about 15 mph in forth gear and go wot and under 2k rpm its lower than 10:1 but once it goes about 2k or over it goes over 17:1 were the wideband cant read no more. Were do I start????