Hey guys I recently tuned my eco and switched to 93 octane. The cars tuned from unleashed tuning for a 93 octane tune and was running perfect for about the first week after the tune recently I noticed that when starting the car I get a weird almost stuttering sound but then corrects itself after a few seconds then idles perfectly fine. A few day’s ago a check engine light popped up so I checked the code and I got a misfire on start, a random misfire and an actuator grille sensor codes. I’m not too concerned about the grille sensor as I’ve read it doesn’t make a huge difference and some people have actually deleted it from their cars (I could be wrong that it’s not a big issue feel free to say so). I know there’s a number of different things that can cause a misfire and was wondering if anyone else has had a similar experience with their car or if anyone could give some advice. Fairly new to building a car and don’t feel like absolutely blowing the motor/car up yet.