2013 Chevy Sonic LTZ 1.4l

Car is currently at the Chevy dealership for the 3rd time within a week. Just looking for possible answers but my car has been stalling when I’m at a stop and has shut off once so far where I had to restart it. Thought it was the fuel pump but tested all the fuel and pressure and everything came back perfect. Thought it was the condenser so we replaced the entire thing as well as the expansion valve because it was having high pressure. Still doing it. They’re doing diagnostics for it but just trying to help them out as well just to fix the problem asap. Sometimes after it stalls out and wants to turn off, it feels like there’s no power so have to really step on the gas, especially up any kind of hill.