Engine noise A14NET

Hello together. Our Zafira C is in pain again. He makes the noise / flapping in the stand. I don’t think it sounds good at all and I’m still worried. If I (is an automatic geriebe) with standing gas stays that, I give a little more gas it goes away basically. In the stand I also have the feeling that it swallows itself for a short time. Do you have any idea what this can be? Have just read something about loose chain tensioners / sliding rails. https://www.youtube.com/shorts/djselSN0C8o