What should I do if the cold car idles and the hot car doesn't sway?

The specific methods of idle jitter of cold car and no jitter of hot car are as follows: 1. First, read whether there is an engine fault code with the automobile fault diagnosis instrument. If there is a sensor fault, carry out corresponding maintenance. 2. If there is no engine fault code, check whether the engine is misfiring. If there is a fire, check the spark plug, steel wire, ignition coil, crankshaft position sensor and ignition coil circuit. Carry out corresponding maintenance and replacement. 3. If there is no fire, retest the fuel supply system and remove the fuel pressure gauge connected to the oil pipe for pressure test. If the test pressure is between 270 kPa and 350 kPa, it is normal. If the fuel pressure is low, check the oil pump for corresponding maintenance. 4. If there is nothing wrong with the fuel supply system, check whether the throttle valve is clean. If the throttle valve is dirty, clean it with carburetor cleaner. Then check whether the idle valve works. If the idle valve does not work, just replace it. 5. If there is no problem with the throttle and idle valve, then check whether the fuel injector is working or blocked. If the fuel injector does not work or leaks abnormally, check the fuel injector circuit and repair it accordingly. 6. If there is nothing wrong with the injector, check the cylinder pressure of each cylinder again. If the cylinder pressure reaches above 8, it is normal. If the cylinder pressure is insufficient, go to the repair shop for corresponding maintenance.