when I come to a stop.and then give it gas it will not go for a second

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it only does it when I come to a stop.and try to take off gas pedel to the flore and it takes I second and then it will take off.i do not have any problem after it starts moving.what could it be?its like it dosent get gas for a second when you stop. and try to take off that's when it happens.and it does not do it every time