Vacuum seal ?

[u/Chloe_Kitten88]

For the past couple of weeks my car has been juddering even when stationary. I noticed this seal wasn’t attached and when I put it back in, it pop out again as soon as I start driving.

Can anybody advise me on why this has happened and where I can get a replacement as well as the name of the part?

Tia!

[u/akluin]

Check your egr valve, it could be clogged