Check the coolant in the engine and if needed gear oil changed again..
I do not think the misfire is related to the repair. You could take a trouble light and look/feel around under the hood to see if a vacuum line is not plugged in or a wire connector has been left unhooked or loose. Then I would try and find a good fuel system cleaner (I recommend Chevron Techron) and run a tank of gas through to see if you are just dealing with dirty fuel injectors.
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