Hi Scotty, 

Hope you are doing well.

I have a question about my particular issue with my car.

I live in Europe and my car is 2006 Opel Astra H 1.4 66kw.

I noticed my car stalling and jerking while on idle but perfectly fine when accellerating and holding the top speed and when deccelerating. Spark plugs changed. 

Here is the link of my video https://drive.google.com/file/d/1Dcwr5p1x6zWn3n-YCcV1WhNIcPFGBfg2/view?usp=drivesdk , on 00:04 is the sound amd every 5 seconds it comes back.

No check engine light tho, but I can feel knocking and shaking on these intervals while in cabin. I also can hear thump at the back at the exahust each time this interval and sound happens.

Please, your advise and oppinion is much of a help.

Thanks in advance and best regards !