I have a 2016 mustang gt with a stage 1 supercharger, dyno tuned on 91, long tubes, catless exhaust. So the check engine light was blinking when I really hit on it but went away after 10 seconds but then after a couple days the check engine light came on for a cylinder 8 misfire I can’t feel the misfire at all. Took it to a shop they told me that can’t do anything but they cleared the code. This was about a week ago and now the check engine light is gone and hasn’t came on. But today I was doing some runs with it and the check engine light started blinking again. Check engine light isn’t on but blinked for 10 seconds so this is only happening when I really hit it. The shop told me that they couldn’t get an active misfire code when they test drove it and did a cold start.