Check the battery's condition.
Whilst you have the battery disconnected, step on the brake pedal to drain all power from ECM.
Hook up a good battery and give it a try. Engine may run rough for a bit, while ECM is relearning.
Check for any DTCs. An OBD reader can be purchased for less than $50 or most auto parts stores will lend/rent you one (some will even walk out into the parking lot and read DTCs for you).
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