It's really knackered on my 2.0 Zetec, revs take ages to come down.

Bought a new pattern one off Ebay but it didn't work at all, car didn't idle full stop, in fact was the same as when original was diconnected. Sent it back and got a replacement and it was the same!

It looks and fits the same.....
Any ideas? Electrically different? Batch of snidey copies?