1.4L Cruze LTZ. Over the last couple of days, I changed the valve cover gasket and tranny fluid. I saw a vast improvement with the drive since. Today, I had new tires put on, and the car drove well for a couple of hours. I just took it on the freeway for the first time today, and ran into some issues. The car started jerking on acceleration, the check engine light was flashing, and the "Service Stabilitrak" warning popped up. I pulled over and turned the car off, let it sit for a few minutes, and started it again. The warning and engine light were off, but the car started whining on acceleration and still had some jerking. I have a video of the sound, if it may help diagnose.