Q: Misfire issue

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I recently replaced the spark plugs on my car, as they were the original plugs. A week or so later I started having misfire issues. P0300, p0301, p0303. Autozone suggested replacing the coil pack since the pligs were brand new. I did. After I replaced the coil pack I didn't have any misfiring. I even drove the car hard to see if it would do it. It didnt. I also put a can of seafoam in my car to clean the gunk out. It seemed to help. It's been about a week and no issues. Do you think I'm ok?

My car has 119000 miles.
My car has an automatic transmission.

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