It's too hot to run.

Is that so? In hot weather, when the car is driving normally 10-20 km (hot), it will not be able to lift the speed, and the car has no power and is in a hurry.

Suggestion: Check the ignition system: mainly the ignition coil, and then check the gasoline pump. Stay where you are, raise the temperature of the car, and then refuel and see what happens. When there is a problem, unplug the carbon canister solenoid valve management to see if the phenomenon still exists.