erratic idle on 2001 Volvo S60

WHEN I START MY S60 2.0 turbo IT IDLES ERRATIC THEN SMOOTH THEN YOU HERE A CLICK AND IT IDLES ERRATIC AGAIN AND IT KEEPS DOING THAT IDLE SPEED BUT DRIVES SMOOTHLY BUT WHEN I STOP AT SAY A TRAFFIC LIGHT IT STARTS IDLING ERRATIC AGAIN CAN ANYONE HELP THANKS

Asked by for the 2001 Volvo S60
1 answer 3 comments
you more than likely have a vocume leak or a frayed air hose: at higher rpm, the engine develops enough suction to intake manifold to run smooth enough but at idle its not sustainable so irratic condition and stalls.
WHERE WOULD I LOOK FOR A VACUME LEAK THANKS
most common vac leak is in or around air/intake hose area. a good visual solves most problems, you may even hear the hiss!!!!
dont seem to be any leaks around the air inlet but what i have noticed is it idles okay but if i switch on any electrics or turn the power steering it idles erratic for a coulple of seconds and goes back to normal what do you think