When Buick GL8 engine shakes, the speed is unstable, and there is thick exhaust gas behind it, which feels like it is fluttering.

Is it possible to lose the cylinder instantly? This is my car. At some point, a cylinder will stop secretly. The fault is caused by the camshaft position sensor. Actually, it's nothing serious. In a word, there must be a reason for the car to shake, and various reasons may cause it to shake, such as poor ignition of spark plug, life of steel wire, dirty throttle and nozzle, life of ignition switch and so on. Check it!