'06 polo suddenly began to stutter under acceleration, CEL blinking

[sambb]

yep its a nest up there until you throw it all in the bin. It may be worth testing the ones you do have one at a time in your engine till you find the bad one. Nothing wrong with keeping 3 spares!

[h100vw]

Plugs arent replaced all that often per VW schedule. So the extra time once every 3 or 4 services isnt a big deal.