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Why would your engine race while in neutral?

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Answer

Vacuum leak. Sensor going bad that will make a fuel adjustment that in not needed. It tells the computer to add fuel, when the computer does, other sensors say that there is too much fuel and tell the computer to back off, thus the idle fluctuation.

Answer

Could be insufficent free play in your throttle cable or a binding throttle cable.

Answer

if you have a carb, it could have been adjusted wrong, i need mine adjusted since the engine is new...usually needs to be retuned with new exhause, engine parts, and eveyrthing related to that.

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First answer by larry harnick. Last edit by Habitatxskate. Contributor trust: 204 [recommend contributor]. Question popularity: 183 [recommend question]

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