my 2001 monte carlo ss starts up then cuts off

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sometimes it will start right up other times it will start up and cut off, i notice that if i give it a little gas and try to start it up it will start right up, it has been in the shop several times for this problem i was told i don't need a battery , fule pump, alternator, starter and etc i recently got a tune up but it still sometimes doesnt start right up please help me