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Have your battery LOAD tested.
You said you have 28 ACvolts across the battery with the engine running? IF you have more than ONE ACvolt your alternator is bad.
When I said code your battery, yeah.... I meant register it. Maybe your ecu doesn't know what kind of battery you have when you flashed your car.
To me it sounds like your alternator or your IBS is not setup correctly. You might want to take the car to a pro.
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