Nissan Repair: micra 2007 acenta, air control valve, vacuum hose

Question
i took my car in for a service and since i got it back it uses more fuel and idles to high and revs climb and fall constantly

Answer
Bryan,

I would take the car back to get it within adjustment.  Now, since they cleaned things up when they did the tune there is a possibility that the car has a loose vacuum hose or the idle air control valve is out of adjustment.  It could need cleaning along with the throttle body.  But, first thought is a loose vacuum hose.