Is this surge definitely caused by the injection? Have you run with the injection disabled to rule that out? It's all hearsay for me,because I haven't done it yet myself; but from what I've gathered, the 5gph nozzle(pre t.b.) is not at all exorbitant. And the SC is evaporating/vaporizing that spray(cooling). That's why it's hard to believe it would hinder the spark. Others have sprayed larger nozzles, as well as additional nozzles in the intake mani.'s without blowing the spark out. I'm totally rooting for you to get this figured out Les. That last tune you got certainly messed up the momentum.