Honda Civic 2004 LX flashing engine light after thermostat change?

I have a Civic that was overheating and I got the engine light checked out and was told to change my thermostat. I changed my thermostat and I refilled it with coolant and for some reason the engine light started blinking and it never went off?

Car is misfiring badly. Shut it down, get a scanner and read the codes. Did you install the thermostat correctly?

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