So i went with the eBay special, people are giving them good reviews so why nlt
I understand it needs setting up, is there a correct way to do this lr just poke with a screwdriver to adjust the plunger?!
Started car but its revving at about 3k so theres obv some setting up to do!
Had this sort of trouble when I fitted a new one (the plunger/electrical part I replaced, into my original plastic housing part)
Started it up expecting a nice idle, only to get circa 3k rpm as you say! Took it back out and moved the plunger bit by hand-can't remember exactly now but sure it just pulls down if not twist aswell.
It was a while ago so don't remember which way I pulled or pushed it now, but I would say pull it out (make the plunger/shaft longer) as this will mean when you fit it back in-it will seal against the bottom,as a 3k idle would suggest air leak I.e valve not shut/fully shut.
I ended up taking it off a couple of times as wasn't sure which way it adjusted, but got there after a couple of goes! Idled fine straight away, so knew I'd got it.