ROW Flash, and Now Car Is Undrivable!

[Dave80GTSi]

Yesterday's "Success" message as I posted here was based upon starting the car in the garage and revving it a bit. Seemed perfectly normal.

Today was my first opportunity to take the car out on the road. Just to be sure, I repeated the "fix" again for a second time as I posted earlier - this time I waited for 1-1/2 minutes with the key on, and then for 30 more seconds with the key off. Car started right up, revved like normal, and I thought that I was all set.

Drive for a mile an a half at slow residential neighborhood speeds, and again all is well.

Until.

With no warning (cruising at maybe 30 mph in 3rd), the throttle becomes non-responsive. At anything beyond about a quarter throttle, the engine drops to idle. I was able to coax it back home, basically idling in second gear. No further time to experiment tonight. As before, no codes nor CEL's.

My question now: Does the car require a learning period of some sort, so that it again learns how to play nicely with the ECU?

Why would it have been perfectly fine for the first couple of minutes, and then it all turns purple?

So, as before, the car is currently undrivable.

DM