I'd say it just normal. The LC-1 has so high sample it shows every misfire as lean spikes and I bet even good engines misfire some? My Innovate products (LC-1, LMA-3, LM-1, LM-2) all jump around 0.5 delta on idle but when on WOT it's much better. How is yours on WOT?
Example of WOT AFR that does not jump around and this is NOT smoothed data. It's easy to show smooth AFR you just dial in filter/smoothing and you suddenly have no more jumps!
Many other widebands have much less sample rate so they can't pic up every misfire so they might show a nicer looking curve.
