Prado 2700 valve sounds stuffy.

One engine vibrates a little when idling in D gear (which is acceptable), and the other engine buzzes near the fuel filler door 1500. At the same time, the steering wheel and accelerator pedal can feel slight vibration and feel stuffy. It's quiet when you turn off the throttle.

The reasons for the muffled sound of the automobile when stepping on the accelerator are: 1, and the cylinder works abnormally; 2, the throttle opening is large; 3. Serious carbon deposition. The function of the throttle valve is to control the filling amount of the cylinder and the metered fuel flow of the fuel regulator by controlling the throttle opening of the carburetor, so as to determine the output power of the engine and make the engine generate thrust. The correct way to step on the accelerator is: 1, and the right heel is placed on the cab floor as a fulcrum; 2. Gently step on the accelerator pedal with the sole of your foot, and step on or relax with the extension and flexion of your ankle; 3, put the accelerator pedal, the force should be gentle, so as to tread slowly.