1.6l manual transmission elantra engine and hood are shaking badly. What is the reason? Is this a waste of oil? One yuan is almost 1 km.

When driving, the engine jitter is more serious than normal, and sometimes it can't be started. It may be that the throttle is too dirty, and there is too much carbon deposited in the nozzle and air intake. In the case of cold car, the carbon deposit will adsorb some fuel. If the fuel does not completely enter the cylinder for combustion, it will cause the symptoms of unstable idle speed and difficult start.