Help:Vacuum leak in a 965 Turbo

[yasir]

Guys i live just outside Louisville,KY area and need help diagnosing a vacuum leak in my recently acquired 965 Turbo.
The problem is if i'm driving slow and nail the throttle the car jerks few times just before the boost kicks in.However same speed if i downshift and accelerate hard the jerking is not as noticeable but i think still present.So my diagnosis is probably a vacuum leak or possible FPR issue ? Can someone recommend a nice Porsche shop where i can take the car besides the dealer ? Thanks
Later, Yasir