Check Engine Light came on briefly - misfiring?
 

Hi guys.
You might recall me from a few weeks ago asking questions about the dealership quote (coils, plugs, starters). Well, the coils and plugs were fixed and all, but I still feel a bit of vibration. That's beside the point.
Today, as I was driving out of town, I quickly tried to pass some cars and revved the car and it went to 95mph before not going faster anymore. I remember trying to go faster but it was capped. Then, the check engine light flashed a couple of times until I got down to 85mph and then it went away. So far, nothing seems wrong with it, but it's a bit alarming. I read that it's quite possibly an engine misfire, which pisses me off because I spent a lot of money having the coils and plugs changed. The engine mounts were also changed.
Can anyone give me any insight?

Yes, a flashing CEL is always a misfire.

https://www.rx8club.com/tech-garage-...t-here-222280/


Because you seem to also be having some higher level power loss, then likely your cat is becoming clogged, having started when your ignition failed. Yes, that can cause a misfire.

https://www.rx8club.com/rx-8-discuss...t-here-202454/

Or it's a ESS sensor trigger issue? That should set a code though.....