Why does the accelerator return slowly when the car is driving, [everything is normal at rest], and the idle speed is high. I just changed the throttle of the spark plug, and it was fine before I chan

Why does the accelerator return slowly when the car is driving, [everything is normal at rest], and the idle speed is high. I just changed the throttle of the spark plug, and it was fine before I changed it. If your car is not too old, the throttle doesn't need to be replaced, because the throttle won't wear so quickly. You should look for problems from the following aspects to see if the throttle shaft end return spring and the throttle pedal return spring are too soft, loose or broken. If not, it should be caused by the tight throttle line, because the domestic throttle line material and lubrication conditions are not very good, and it is not so smooth to use. The resistance of the throttle line is very small, and it will return to its position quickly under the action of the return spring. If you return slowly, it will increase fuel consumption and shift gears smoothly.