So i recently was getting missfire in cyl 4,5,6 and turned out my mosfets went out. So i ended up upgradeing to msd81, did new plugs (gapped .019), coil packs, index 12 injectors and o2 sensors. Car is on 20psi and drive perfectly fine untill i go wot. 6k+ rpm and sometimes before i see the afr2 peak 20 and then goes back to normal then back to 20. Not sure whats wrong.