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2000rpm idle

  clio sport 172 ph1
when pulling up in traffic my ph1 172 sometimes idles upto 2000rpm, but settles down once i tap the throttle pedel. any ideas?
  197 ff albi
my mates did this but all the time, he had to have a new throttle body as the spring had gone; common fault apparently,
but first before jumping the gun and spending out try cleaning the VDO mines idling funny and have been suggested to clean it out maybe worth a shout before breaking out the pennies
Mine does this...

Ive replaced the idle control valve, ive had the throttle body completely off and cleaned it all out, then re-fitted with new gasket. Also replaced the throttle cable, and it still does im putting it down the spring internally in the throttle body tbh!