The car is not easy to touch, it will catch fire as soon as you step on the accelerator, and the oil circuit is fine. What is the reason?

Is it a carburetor? Holding down the throttle will increase the vacuum force of the throttle and increase the injection pressure. In this case, you should check whether the gasoline pump is normal, whether the gasoline filter is unobstructed, and clean the throttle. If it is EFI or computer-controlled fuel injection, just check the above items.