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Since that is the only code pulled, I don't suspect a vacuum leak. Usually a vacuum leak will cause a random misfire and not one specific cylinder.
Now, the plugs could be an issue or a plugged injector. So, here are two links. The first explains how to check for ignition spark. Check cylinder three to confirm the coil and plug are good.
https://www.2carpros.com/articles/how-to-test-an-ignition-system
Here is a link which explains how to check an injector.
https://www.2carpros.com/articles/how-to-test-a-fuel-injector
You will need some basic tooling to check both. Here are links you may find helpful.
https://www.2carpros.com/articles/how-to-use-a-voltmeter
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
https://www.2carpros.com/articles/how-to-check-wiring
Now, the easiest way to check if a coil is bad is to simply switch it with a coil from a different cylinder. At that point, drive the vehicle until you feel the misfire and the check engine light turn on. Next, scan the computer to see if the misfire has changed cylinders. If it has, replace the bad coil. If it hasn't, then either a plug or injection issue is most likely.
Let me know if you have questions or if any of this helps.
Take care,
Joe
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Thursday, October 17th, 2019 AT 9:26 PM