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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

Asked by for the 1999 Infiniti Q45
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.
Theo
I have already done tune up. the car starts but cuts off right away. could it be the idle air control valve?