I'm using a narrow band and a multimeter (I know it sucks), I actually had a little bogging at about 5k rpm that went away when I turned down the rate of gain on the fmu, the narrow band still reads 1v at wot so I don't think I'm running lean. I'm running 91 octane. Are aftermarket ignition packs universal?

 

You might be getting misfire due to too much fuel or spark blow out.