206 exhaust blast sound

Hello friends, I bought a 206 xr automatic gear car 1 month ago. There is a popping sound from the exhaust. The explosion only happens when the slope goes down and slows down. It certainly does not happen when pressing the gas. I replaced the spark plug and ignition coil, the problem continues. The master ignition may be a problem in the brain, I think the ignition is interrupted for a short time, the gas explodes when the raw is thrown away. In short, there is a lot of information on the internet, they are all different. I ask for help from friends who have experienced this problem or who know the solution. Thank you in advance.

any friend who knows: S :(

I saw that the topic was in the forum, but search

Hi brother,
I also suffer from the same problem, after having the gas installed in the car ... I started to hear this sound.
I changed the spark plug and coil. However, I still hear from time to time, especially when I go to the long bar when I pull my feet out of the gas.
I did not have a problem with all the crockery of the vehicle .... But since I did not wear it very often, I did not have any trouble for now ...

When you take your foot off the gas, you should normally enter the box, as well as cut the gas, it may not cut the gas.

I have never tried gasoline when it is in LPG. It does not happen when pressing the gas, usually when driving on a straight road or downhill motor braking, sometimes even when applying the brake. Not every time, but it happens 3 or 5 times a day.