What is causing your peugeot 206 to over rev?

well there is 1 possible solution that it could be the vehicles idle control valve i had the same problem being a mechanic i understood it

while idle on the drive way it was rising from about 3000 - 4500 obviOSly not good for early morning starts at work :( i took the the 8mm bolt out gently removed idle control vave and cleaned it with a DRY rag rebiult it back up job done in no time :)