1993 Geo Prizm 1993 Geo Prizm cranks but won't start

My 1993 Geo Prizm cranks but won't start. The car was running fine until 1 day out of the blue the car just stopped running while driving down the highway. What I've done so far is replaced the spark plugs and then tested them, so I am getting spark into all cylinders. I cleaned the Mass Airflow Sensor and I pulled each injector to see if it was clogged, they were'nt. Interestingly enough while the injectors were out I got a little gas down the cylinders and the car started and ran for about 5 seconds, so I shot a little hot start into the air intake and it did the same thing. I getting get fuel pressure up to the injectors but there not letting the fuel into the cylinders. I'm at a loss of what to do next.