1992 Mazda Miata MX-5 Questions

Unanswered 1992 Mazda Miata MX-5 Questions

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Now there is a high pitched hum when it hits 55 - 60 mph. It only lasts a second or two, but it accures about ever minute or so. When you turn off the air, it goes away. Any ideas? The car is great otherwise. One ow...
New plugs, wires, air filter..ran a tankful of high octane. Tune-up. Any suggestions before taking it to a real mechanic.