Definitely replace the t stat if it’s an issue. Maybe that could be related. If not, at least you ruled out another obvious problem.
I would agree with earlier posts, and you should personally look at the engine and transmission wire harnesses very carefully. Everywhere it’s close to contacting anything. Brackets, frame, metal clips etc. The way you describe it happening over bumps, accelerating, (engine moving/twisting), it sounds like a signal is getting disrupted and causing the misfire. This would only take one strand of a chafed wire rubbing on any ground point.
Not discounting the shops you have had it into, but you can do a more thorough job than they probably will.
Also check all of the drivetrain fuses. Pull them out and look carefully at them.
Even check connectors on all the components. Look for pins in them that may be pinched or opened to far/loose. You can do a “pin drag test” if you get the proper sized test probes. It checks the tension on the connection between the male and female pins. Unlikely, but it does happen. Look for any corrosion in these areas.
I’m not familiar with this drivetrain. Does it have any additional type of ignition module besides the main ecu that was already replaced?
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