u/Remarkable_Farm_3877

I was maybe trying to get ideas on my 2019 Mustang GT. It's been having trouble recently. Every time I get to a red light or a stop sign, or pretty much anytime, I'm just sitting still idling. It starts getting really rough, almost shaking the car.I've brought it to a mechanic, and they said it wasn't a vacuum leak, but I'm starting to doubt maybe the mechanic isn't truly checking. Turns out this is a big problem in the 2019s or at least the predominant enough problem where I find it enough online. I was just looking for any information on this problem. Kind of sucks that my dream car just started acting like this. Only 22,300 mi on this car. Should I give up on this car? I tried so hard to get it.