If your car is not getting accelerator at slopes, this could be due to various reasons. First, it could be a problem with your car's fuel injection system. It could also be because the transmission could be slipping or there could be an issue with the fuel pump. The problem could also be related to your car's catalytic converter.

To diagnose the issue, you can check the car's spark plugs and air filter, as well as the fuel and air pressure. You can also check the car's brakes to ensure they are not dragging and making it difficult for the car to accelerate. Additionally, you can check the car's transmission fluid level and condition to make sure it is not causing the slipping. If the issue persists, it is recommended to take the car to a professional mechanic for further diagnosis and repair.