h3 hummer needs a tune up. What parts do I need and what will the cost be ? on 2006 Hummer H3

My Hummer will not start some times I have to let it sit 15 min then try to start it .I hear a wizzing sound like a loose belt.

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1 answer
Not sure a tune up or routine maintenance will cause/fix your issue. When it does not start...does the engine crank over? the whizzing sound...do you hears this in engine area or towards back of the car by fuel tank area?