2019 Chevrolet Cruze VEHICLE SPEED CONTROL,ENGINE

Unknown I purchased this vehicle in 2019 About 2 and half years now. This car engine is malfunctioning. When i am driving uphill the speed is not transitioning and it had caused other vehicles behind me to slow down. Second major problem is during the summer season the speed does not adjust easily . I would have to press on the gas so hardly to be able to proceed. The worst of all is when am at a traffic light and it turns green that I must proceed the car will not move. I get stuck for a short period and then i would pressed on the gas and all of a sudden you will hear a heavy noise. I drive without AC in summertime often because the car would be stuck, stuck i repeat on the road without moving if my AC is on. It is terrible i must turn off my AC to be able to drive and if i do not am at risk of getting hit by the car behind me. This has been so hard on me and i am really distressed.