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Very common problem with Z31's as there are a ton of vacuum lines and if any of the are leaking the pump will not shut off. Google Z31 vacuum troubleshooting and you will find a lot of help. basically you should replace all your vacuum lines as rubber tends to get hard and crack after 30 years.
 

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Very common problem with Z31's as there are a ton of vacuum lines and if any of the are leaking the pump will not shut off. Google Z31 vacuum troubleshooting and you will find a lot of help. basically you should replace all your vacuum lines as rubber tends to get hard and crack after 30 years.
Hi, thanks for that. So it is related to the idle surging as well.
 
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