Cars lack of power

I just got a 99 volvo s70, after starting the car, when you first take of, and any time your driving it, after you make any stop[ and you start to take off again, the car has no power. After you get going it drives fine, its just you intial take off lacks power. I cant pull out in front of anyone because id get hit. It reminds me of the flintstones and how they have to use there feet for the initial takeoff, but then there fine. I just drove it 1100 miles from my daughters in new york to where I live in kansas and everything else is fine but that. So my question is what causes that lack of power on takeoff? Thank you