[Corsa C 2000-2006] Corsa c 1.2 16v losing rev why idling

[Fusion]

Hello I need some help with my corsa c 1.2 16v sxi why it idling at traffic light or at junctions some time it will go to lose rev and rev back up or lose all revs and cut out could anyone help me thanks

[Taurus]

There's no idle control valve on that, it's done electronically by the ECU controlling the throttle, usually this is a sign of a dirty throttle body. I'd give the throttle body a good clean with carb cleaner. The stuff I use is this stuff - it's better than automotive carb cleaner QUICKSILVER POWER TUNE | eBay