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vacuum leaks can be hard to find. caution should be used if you try this method. using a can of starting fluid, avoiding anything hot or the carb intake. shoot it sparingly at various vac hoses while engine running. if it revs up you've found a place where its sucking in the starting fluid meaning there's a leak. its quick and dirty but be careful since starting fluid is highly flammable.

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Q: How do you look for a vacuum leak for 1990 chevy pickup 5.7?
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