Engine over revving

[Jamesk89]

New to all this and recently bought a mk1 1.8 16v with a 172 engine in. I give it a bit of a hammering the other night and its began to over rev, on idle and basically when ever it's not in gear its revving at around 1500-2000 rpm. Any one have any ideas on what this could be? Is there a common faulty sensor? Etc

 

[Ryanph1rs]

Check ur maf sensor mine usto over rev as I accidentally left it unplugged ones also if its the cable throttle moe like mine check ur icv carb cleaner it all and see what happens

 

[Jamesk89]

Will give that a go, thanks for the help.