Coil Confusion

My son came home from school and reported NO Stalling!!
He was glad to be spared the embarrassment.
My son informed me that on the way home, the car "stalled" for a half second, but restarted on its own. (I don't know if there's a special name for that other than stalled)
I immediately checked the coil. It was warmer than the day before, to the point that I couldn't keep my hand on it.
As I mentioned before, I'm running an Orange ECU and a .9 ohm resistor.
My question is now, am I running the appropriate resistor for the orange box?
This is just a daily driver for my son.
I'm trying to avoid jumping into an MSD box (even though I'm so tempted). lol
Thanks