Rev counter sticking,Idle problem

[Mick a3]

I find If i start my car and immediantly and drive off in it, it runs like a pile of **** but heres the odd bit .......if i let it Idle for 2-3 minutes it's fine? Ive noticed when starting the car and watching the needle the revs move ever so slightly but after a few minutes it stops?

My rev counter has also has the tendancy to stick sometimes? and even goes off the clock!

Can anyone shed any light on this problem, I'm thinkign it might be some kind of idle control valve ? and the clusters ********?

I've got the 2.0l FSi

Thanks
Mick