At first, the idle speed decreased and the jitter was serious. When the idle speed itself is a little loose at 1000 rpm, the clutch will start to shake unless a Chinese pine clutch is added.

If the abnormal start-up is ruled out, the car runs normally in all aspects, and it is likely that there is something wrong with the control unit, and the direct component to control the idle speed is the idle motor. As a layman, I usually call it solenoid valve directly. Its function is to control the air intake of the engine and maintain the idling of the engine, which is the same as the throttle. The control logic of automobile computer should be: when the clutch is slowly released, with the increase of engine load, the intake air to maintain idle operation will not meet the normal torque requirements of the engine. At this time, the computer will control the solenoid valve to increase the air intake, so as to ensure that the engine still keeps idling when starting and after starting. If the idle solenoid valve does not open further quickly at the start, the situation you mentioned will appear, and the idle speed will drop sharply. If the right foot accelerator does not catch up quickly to make up for the failure of the solenoid valve, it will stall. Of course, the idle motor may be stuck, or it may be inflexible and slow to respond, and it is more likely that it will not be powered on. This problem has appeared in my car twice, and I solved it myself. They know how to find a car repair, so they can ask you a lot of questions. We amateurs don't know much, and we only look for problems.