Clicking noise at idle?

[Lightman]

I just got my car back from the dealer, they put a new valve cover on and vacuum pump o-ring. Now i was at a drive thru today and heard a strange clicking that was intermittant and sounded like it was coming from the engine or below the car.... any ideas?

 

[runonbeer]

my vacuum pump ticks or clicks or whatever. don't know why, don't know if its bad.
I wonder how much a new one is????