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Basically i went to work the other day and the car was runnin fine, it was a bit cold & rainy throughout the whole day....

I started my R33 GTS up after i finished work and it jumped straight to 2000rpm without even touching the accelerator. I reset the ECU when i got home but it's still doing it? Any ideas what to do??
 

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will it rev freely still? Is it just a high idle or are there other symptoms?
 

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My car did it a few months ago and it was a split vacuum pipe.

Check for a " sucking sound" while engine running in the engine bay.
 

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turn car on, pop bonnet and check the throttle body. it should be fully closed. then cehck for any vacume leaks. after that, u should take out teh idle control valve and clean it. then do an elctronical idle adjustment to roughly where u want it, then fine tune the adjustment mechanically on teh ICV
 
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