How much does it cost to change the cylinder gasket? Is it the same to replace the valve cover gasket and the cylinder gasket? My car will shake if it doesn't run at first. What's the problem?

The valve cover pad is a valve cover pad, and the cylinder pad is a cylinder head pad, not a part.

Due to the quality of domestic fuel, some carbon deposits will be produced in the cylinder, throttle or fuel injector, which will lead to the fuel mixture in the cylinder not reaching 1: 1, so the cold car will shake when starting. It only takes 3-5 minutes by car.

Engine jitter is related to many reasons, such as excessive carbon deposition in intake system such as throttle valve and idle valve, poor atomization of nozzle and poor working performance of ignition system, which is directly related to the working performance of spark plug, high-voltage line and ignition coil. Moreover, if the working performance of related sensors is poor, it will also lead to idling jitter, such as water temperature sensor, air temperature sensor, air flowmeter or manifold pressure sensor. The specific reasons are suggested to combine the above analysis of 4S.