Q: check engine light with a code 5010 missfire in cylinder #2, what is this? on 2002 Ford Focus

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My son took his new ousted car back to school. 280 miles into a 350 mile trip he stopped for gas and the engine light came on and he made it the rest of the way and took to auto zone Nd got a code of 5010 missfire in cylinder #2! What is our next step?
(1) Answer
Usual cause for this is: faulty or failing spark plugs or the ignition coil for cylinder #2 needs replaced. Here is the firing order;_ylt=A0PDoV21QMRPNggANNmJzbkF;_ylu=X3oDMTBlMTQ4cGxyBHNlYwNzcgRzbGsDaW1n?