Why does my car jerk when in idle?

Idle speed is the speed at which your engine runs when you are not applying any throttle. Most cars have an idle speed of about 600-1000 RPM. If your car is jerking at idle, it could be caused by a few different things. One possibility is that your idle speed is set too low. When your idle speed is set too low, your engine can stall when you come to a stop. If your idle speed is too low, you should have your car serviced to adjust the idle speed. Another possibility is that there is a problem with your fuel injection system. If your car is jerking at idle, it could be caused by a dirty fuel injector or a clogged fuel filter. If you think there may be a problem with your fuel injection system, you should have your car serviced by a qualified technician. A third possibility is that there is a problem with your ignition system. If your car is jerking at idle, it could be caused by a faulty spark plug or a problem with your ignition coil. If you think there may be a problem with your ignition system, you should have your car serviced by a qualified technician.