I'd say if the car was running fine before, just buy one new stock coil. If that plug coming out didn't mess up your threads, maybe it wasn't tightened enough by whoever installed them. Could have wiggled loose due to vibration and then just popped out when there were enough threads to hold it. I once had a spark plug come out of my dirtbike while I was riding. I thought it was ruined...but I put it back in when I got home and it never gave me a problem again.
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