Had an intake leak few years ago on my Firebird. Never heard a whistle but my time slips told me something was wrong. It was on the low side and wasn't obvious when trying to locate it with a spray. When we pulled the intake a sharp eye (not mine) noticed a slight stain under #3 port. New gasket solved the problem.
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Ain't as good as I once was, but I'm as good once as I ever was.
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