I'm trying to select few rogue flip particles to delete them, if I simply tried to delete them by ptnum, they'd respawn the next frame, so I can only delete them by ID, is there a fast way to select particles by id?

after you import particles in SOPs
- display node after which you want to delete and make sure your particles have i@id attribute present
- activate selection tool in the viewort (S and then 2)
- make sure Select Groups is active (9)
- click Cog menu on the Group and Attribute list that appeared in top-right
- choose Attributes/id
- select particles and hit delete
- it will create Blast node and populate Group with something like this: @id=1823,1787,1763,1747
- you can also populate your Group parm like this manually if you know which ids you want to delete

Yes! Thank you again tamte.