Why did my car run out of gas at about 4000 rpm in third gear?

1) Two cases 1, dirty throttle, and 2) faulty fuel injector. 2) There are three situations. First, the throttle is dirty and needs cleaning. Second, the idle motor is out of order; The fuel injector is also faulty. You should have no problem with the normal ignition of the spark plug, but it is recommended to check the spark plug for dirt and carbon deposition 5000 kilometers.