A misfire in and of itself will also cause a lean spike in the exhaust, rich, lean, compression, or spark induced.
I don't think this is from shifting either, otherwise this guy is a hell of a lot faster than humanly possible given how rapid some of these spikes are. Not enough gears for the amount of spiking either.
Need more data to confirm if it is under load the entire time or not.....
2011 GT 6MT (Cookie Monster) - The 1/4 life crisis. Brembos, 401A, drop top, Grabber Blue.
1974 Dodge Challenger - The money pit. 408 SB stroker, Megasquirt 2 EFI, 904TF, 3.91 gears. 16MPG and 520HP goodness
2004 Hyundai Tiburon - The winter beater.