Welcome to 2CarPros.
Many different things can cause a misfire. When the engine's RPM are high, the miss just isn't as noticeable.
Here is what I suggest. First you need to determine which cylinder has the misfire. To do that, you need to have the engine computer scanned for diagnostic trouble codes. Here is a quick video showing how it is done:
https://youtu.be/YV3TRZwer8k
I realize most people don't own a scanner, but most parts stores will do it for free or lend or rent a scanner to you.
I could provide many different possible causes, but it would become very confusing and frustrating for you to do all the tests. By providing the trouble code, I should know exactly which cylinder we need to focus on first and what to check for.
If you would rather me provide a list, let me know. Otherwise, I will watch for your reply.
Take care,
Joe
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Sunday, April 21st, 2019 AT 8:00 PM