Fuel injection trouble shooting, I need a new pressure sensor Options

[jporsche914]

Last weekened i decided to test my pressure sensor to see if it would hold vacuum. I dont have a vacuum tester so sombody suggested for me just to suck on the hose running into to the sensor to see if it would hold any. It would hold pressure for about 5 seconds. I know it it supposed to hold 15 pound forever so i need a new one. I know that new is always better than rebuilt but the only new one i found was 1100 dollars and with the rebuilt one being only 135 dollars with a two year warrenty so the rebuilt is the one i want to go with. My question to you guys is what consits of the rebuild? Do they just fix what is broken or do they replace it with a good used part? Do the rebuilt ones perform as well or close to new because my car runs ok right now. It idles at 2000 rpm but does not hunt and the aar is stuck close. It also has no pickup below 3300rpm but after 3300 it goes as well as a 1.7L. goes. It also get bad gas milage. Could a leaky pressure sensor cause all these problems? The motor is a stock1.7L that was completely rebuilt about 2500 miles ago and the the point, and rotor were replaced and the dwell was set.
Thanks alot,
James