boxster004

Hey guys, I haven't posted a thread in a while but i am having a seriosul problem with my car. When I am stopped and start to accelerate, my car sputters and shakes, but when i am at a constant speed there is no problem at all, the problem also occurs when I am at a uphill stopsign or light, where my RPMS will go crazy and start sputtering,
I have been told that it could be my spark plugs, my fuel pump, or maybe I just need a new fuel filter. If anyone knows what is goin on, I could sure use some help, thanks
Andy