What should I do if Highlander's idling jitter is serious?

Possible causes of engine idling jitter: 1, leakage of intake manifold or various valves, resulting in the change of mixture concentration, excessive dirt on throttle and intake, and inflexible throttle action;

2. Idle motor and solenoid valve are stuck;

3. Incorrect air intake, unstable fuel pressure, spark plug failure and lack of cylinder;

4. Fuel injector failure, ignition coil failure, and inaccurate ignition time;

5. The cylinder is worn, the cylinder pressure is unstable, and the three-way catalyst is blocked.

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