What is wrong with my vehicle?

We bought a 2012 Dodge Journey sxt with 30,000 miles on it. From day 1 we’ve had issues. One of the back brakes were hung up and turning blue. Had that issue fixed. They also replaced all brakes and rotors at the dealership. After still having additional issues we brought it back a few times and they keep claiming they can’t find the issue. It’s very frustrating because I know the car has problems. Here’s the list:

-Engine surges while stopping.

-Moment of vibration when decreasing speed/coming to a stop. It usually occurs somewhere between 20–30mph. It’s hard to catch if you’re not paying close attention because it can be mistaken as hitting some small bumps in the road.

-Feels sluggish when accelerating.

-Hard shift when accelerating.

-Car doesn’t start to roll from a complete stop when you let off the brake. The gas must be pushed before the car will budge.

Whether these problems are all related to one issue or several, I have no idea. Any ideas as to what the issue(s) could be?