185 miles on the clock so far, driving hills and city streets, A/C on and off, and still no stumble! Running actually quite a bit smoother than before. No shudder either still when cold.
The version that the ECU was updated to is the latest greatest, but currently not available at Crevier or many other dealers. The procedure took a week because they had to actually ship my ECU to New Jersey and wait for it to come back. But so far, it seems to be the real thing.
I forgot to mention that I also had some bushing in the transmission replaced. Shifts are super smooth and happen quite fast. Getting into reverse is also a WHOLE lot easier too! The bushing were replaced because I was getting a weird squeaking noise when upshifting from 2nd to 3rd and from 4th to 5th.
Daytime running lights are also pretty nice to have. But, that’s just me. More update on the stumble as it becomes available.