Fiat Punto Idle Air Control Valve Problems

when iam parked up r waiting at traffic lights my car just cuts out but it starts straight back up. and no i havent stalled it. just had a full service any ideas? also my cig lighter doesnt work for my sat nav ive changed the fuse but nothi...

i can leave my car ticking over then suddenly it will rev up on its own i then have 2 switch it off if dont it will go bang

The car start fine and drives well but some time when the engine is warm it will cut out when you stop and is some times hard to re-start.