prime-R

So my question is how can I tell if my ecu is fried?I suspect it is beacause of what's happening recently.So I was driving normal and my car started bogging and backfiring at low rpms.Once I started to speed up it would go away went home and never happened again,about a week later it did it again but it was worst except this time it would go away at high rpms and then a cel came on,it was cel 9 cylinder position sensor.So I procedded to fix it piece by piece,I check to make sure all my dizzy connections where good and reseted my ecu,cel went away and the car drove fine.Now it still doing the backfiring but no cell and it hasn't stop