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Q: the car will crank but wont start on 1999 Infiniti Q45

I was driving yesterday and the car shut off and i cant get it to start up. have already done tune up but still will not start. please help
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There several reasons the engine would not start. It is imposible to tell what it is without diagnosing the problem first. Without more info, or a car to look at my guess is as good as anybodys.
I have already done tune up. the car starts but cuts off right away. could it be the idle air control valve?
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