it runs fine but there is a loud squeel when it gets hot
quick inexpensive repair for intake gasket vacuum leak on 2005 Mazda Mazda6
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?
Got to agree with ziptie, if vacuum leak should not be running "fine". Does it have rough idle??