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Simplest way to reset the memory, if you don't have a scan tool, is to disconnect the battery for 15 minutes and then re-connect. If the O2 is leaking, it could make the system overly rich by possibly pulling in extra air. The ecu would see this as lean and then try to richen up the mixture, possibly to the point of misfire. But I would start simple first and try to clear out ecu memory by disconnecting the battery.
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