Welcome to 2CarPros.
When you get a misfire at idle, the first thing I think of is an engine vacuum leak. Here is a link that explains how to check for vacuum leaks:
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
Now, if the check engine is coming on or flashing, you really should scan the computer to see what diagnostic trouble codes are stored. That will point you in the direction of the problem. Here is a quick video showing how it is done:
https://youtu.be/YV3TRZwer8k
I realize most people don't own a scanner, but often times a parts store will check it for free or lend/rent a scanner to you.
If the light is on, here are a few links you may find of interest:
https://www.2carpros.com/articles/check-engine-light-top-ten-reasons
https://www.2carpros.com/articles/check-engine-light-is-it-safe-to-drive
https://www.2carpros.com/articles/check-engine-light-clear-codes
Let me know what you find. If you have it scanned, let me know the codes that are retrieved.
Take care,
Joe
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Sunday, June 23rd, 2019 AT 8:57 PM