1990 Oldsmobile Cutlass car wont start

I have a 90 oldsmobile cutlass with real low mileage. I drove the car to the store and it was fine nuthing happened. Once I got bak into my car and I started it, it started fine. Once I started going onto the street the car all of a sudden dies on me while driving. So I pull over and I try to start it back up but it wouldnt start back up. I tried and I tried. All the engine would do is turn on for a split second and die down. The way I got to the car running was. As soon as I turned the key over I started to pump the gas and it stayed on while the rpms were high and I kicked it in drive and went on my way. 2 mins later the car dies down again. So I pull over and try the same thing but the car wouldnt start anymore. Just keep acting like it was gonna stay on but it just kept turning right off. I though it could have been my battery or my alernator but I removed them and got them tested and they were both in good condition. So it wasnt those parts. I also tried the port hole from the fuel rail thing. I turn the key over and I would go bak and hit that port hole and gas will squeeze out. I already checked my fuses. WHAT ELSE CAN IT BE? I NEED HELP. ITS MY ONLY CAR RIGHT NOW AND I HAVE A NEWBORN THAT NEEDS TO BE GETTING TO HIS PEDITRICIAN. NEED SERIOUS HELP.
THANK YOU.