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When you have a big vacuunm leak your car is not going you be able to suck the gas it needs into the intake because, the air it needs to do that, is coming from somewhere other than the throttle bore. So to stay running, the choke will have to be partially closed to help suck more gas down the intake. I know this because I asked the question yesterday and found out for myself today by trial and error!

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Q: What happens when you have a big vacuum leak?
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