1.6 What is the reason for the unstable idle speed of Corolla?

1.6 The reasons for the unstable idle speed of Corolla are: leakage of intake manifold or various valves, excessive fouling of throttle valve and intake, fuel injector failure, fuel pressure failure, ignition module and ignition coil failure, or spark plug and high-voltage line failure. Take Corolla 20 17 manual GL as an example. Its body adopts a four-door and five-seat sedan structure, with a minimum ground clearance of 145mm and a fuel tank volume of 55l. In terms of power, the Corolla 20 17 is modified 1.6l manual GL is equipped 1.6L naturally aspirated engine. The compression ratio of the engine is 10.2 to 1. The body is made of aluminum alloy, and the transmission system is matched with a 5-speed manual gearbox. Million car purchase subsidy