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Hunting at low revs when warm

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My engine hunts when the accelerator is at around 1500 revs, when warmed up and varies by about 800 revs up and down.


I know it might be an air leak but it's odd that it does this at this particular speed. It's fine to drive. Any obvious thoughts?




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Is the throttle position switch correctly set up?  They can sometimes fill with oil (if they sit underneath the throttle body) which can short out and give false feedback to the engine management unit.


The idle control valve can also stick and produce uneven idle.  This can usually be resolved by cleaning the ICV out with carburetor cleaner.






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