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I have a 1977 Ford Mustang with a 302 in it with an automatic transmission, and I think I have a vaccuum leak. Does anyone know the best way to check this?
 

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The best way is with a smoke machine. If you don't have access to one, either do a very close visual inspection of ALL vacuum lines, use propane around the intake manifold, or vacuum gauge on all lines. Good luck.
 

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here a trick you can do, take dish soap, with water, spary it on the vac hose ,the one that got the bubblel be , the leak
 

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well a vacume gauge is good start. then start engine . a squirt bottle set on stream,squirt water around vacume connections.the rpm will smooth up when you squirt the problem spots,u can do it!
 

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Soap Bubbles, Vacuum, Bubbles? Its sucks not blows so that wont work. Start engine, spray some WD-40 around suspected area(s), if engine idle changes then you have found your leak...
 

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You can use brake cleaner or a can of quick start. Get 2-3 cans and spray all lines with vehicle running. Listen to the idle, when it drops at a certain area you're spaying at, you found to leak. The other way is by sound sometimes, vac leaks are usually noisy.
 
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