I swapped the old coil back onto the GTS and it still runs fine. The issue was definitely the ECU.
New part less than 18 months old and only 200 miles on it.
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Replaced it with the 15 year old Mopar Orange box that came with the car and has over 12k miles on it.
I’m pretty sure I know why the new green box failed and the old orange box is still going strong...
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