What is the reason for sagitar 1.4t idle jitter?

Sagitar 1.4t Idle speed slightly wobbles Reason: 1, dirty throttle. If the throttle valve is too dirty, it will reduce the intake volume of the intake manifold, which will not reach the normal air-fuel ratio and will cause engine jitter. 2. There is too much carbon in the engine. Because the engine air intake is surrounded by carbon deposits for a long time. A long time will lead to lax valve closure, and in severe cases, the engine will shake. 3, spark plug or ignition coil failure. If the spark plug is not replaced for a long time, the electrode gap will be too large, which will affect the ignition time, not only cause engine jitter, but also increase fuel consumption. So is the damage to the ignition coil. 4. The fuel pipeline is blocked or the fuel nozzle is blocked. Too dirty gasoline filter element causes unstable oil pressure, poor atomization effect of nozzle and insufficient combustion, which will cause engine jitter.