Stop in for a cup of coffee

I’ve had it happen before with the ECU, one minute fine...the next no start or rough running...then fine again.

When they get wonky like that it’s mostly related to temperature. Did you guys move the car indoors and warm it up?
Nope. I will get a spare ECU sometime soon, but with all the testing between yesterday and today I am quite confident it is good today. No bets on tomorrow. LOL