quick inexpensive repair for intake gasket vacuum leak on 2005 Mazda Mazda6

it runs fine but there is a loud squeel when it gets hot

The most inexpensive way is to fix it right .......once. If the gasket(s) leaking , replace it.Are you SURE about the cause of the squeal?
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Got to agree with ziptie, if vacuum leak should not be running "fine". Does it have rough idle??