I'll try to tell you . Somethime it's hard to describe something in a writen format...
Place yourself in front of the fuel pressure regulator (FPR). Their is a vacuum line that brings vacuum to the FPR from the intake manifold. Take this vacuum line out, then take some blanking plugs (You can buy them at Crappy Tire)and plug the nipple at the intake manifold so you dont create a vacuum leak.
This will give you more fuel pressure at lower RPM (High Vacuum) I don't know if it will make the car go faster but it will reajust the mix, specially if you did some mod to your MAF. By the way are you using a Air/Fuel meter??? If not, use a Digital volt meter to measure the output of your o2 sensor. Basicly this does the same as a Air/Fuel meter.

Hope this helps.

Ghislain.

Tell me if this helps.

Ghislain