Peugeot 206 Flicker

Hello friends. I have 1.4 Gasoline / LPG 206. Excessive chills have occurred in my vehicle after starting it for the past 10 days. As if the car is officially braking. I expect help from friends who know about the solution or the reason. Thanks.

It looks like a jitter caused by the engine's misfire. The way of the mechanic appeared. You can check spark plug wires yourself