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need input after whipple 2.9 install

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I m not new to the forum but this is my 1st post, so let me start by saying thank u for alot of great information ,u shelby guys really look out for each other ,hope to get sum input on my issue . I just installed the 2.9 with 3.25 pulley on a 2011 , did not change throttle body or mass air ,and the car has a jlt intake pipe and k&n filter. When u are under slight acceleration its like the car is almost pulsating , could this be a vacum leak or am i choking it with the stock throttle body and MAM. Also looks like the bypass is working or i can see it open when u start the car . post-39763-0-07932500-1372359460_thumb.jpg


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