What Causes Sudden Engine Idle Instability?

[Lucy]

Here are the specific reasons for sudden engine idle instability: Engine oil passage blockage: The engine's power comes from the combined action of ignition, air intake, and fuel injectors which determine fuel combustion. If the air intake volume decreases, ignition weakens, or fuel injection reduces, it will lead to insufficient power, resulting in a jerking sensation. Dirty transmission fluid: This can cause damage to the solenoid valve. Sludge circulating in the transmission fluid may block the oil passages in the valve body, leading to jerking issues. Over time, this can result in a series of transmission problems such as overheating, impact, and slippage. During the break-in period: A slight jerking sensation while driving is normal as the vehicle's power output and component engagement are not at their optimal levels. Additionally, the transmission computer has a self-learning mechanism that continuously adjusts oil pressure for gear shifting.