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The o2 sensors don't start giving feedback to the ecu that quickly.
Unplug one coil at a time until you find which cylinder is dead. You'll notice by that the engine runs the same when you unplug it.
Try moving that coil to another cylinder.
If the problem moves with the coil then it's the coil. If not, it's not the coil.
Check the wiring and plug to that coil. Nothing changes?
Then move the injector and see If the problem follows the injector.
 
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