Thanks enuff_zed, appreciate the heads up, yes its the 3.0 - I have a feeling it's the diaphragm in the unit that needs changing though, revs jump when I put my foot on the break pedal, suggests a vacuum leak? -odd that it only does it in the first few mins when it's cold, then seems to settle , but the idle is still a little off - I've watched a couple of vids on how to change the diaphragm, but it looks like there is a chance of snapping some lugs and it not going back together., so i was after an original spare so I'm not stranded if that happens. I think the previous owner had already used an upgrade kit, but I don't think it was a metal one, I really just need to take the thing out and have a look - and put a metal one in either way.