97 astro van stalling

mew member hope someone can steer me in right direction,ran van to baltimore from phila area ran fine, coming home on 95 pulled to rest area, when leaving out on ramp eng quit,no hesitation .put in neutral cranked and wouln'tstart cycled key off started ,went about 5 miles happend again,put in neutral cranks but wont start cycled key off cranked fires back up did this about 20 times on way home about 70 miles, next day changed fuel filter blew thru didnt seem to be restricted,also changed eng oil ,oil level was about 3 qts overfilled installed fuel gauge key on fuel press 60 psi shut key off drops to 50 within 4 min removed upper intake represurized fuel system i didnt notice any leaks im replaceing fuel press reg and 1 injector because of broken clip is there anything else i should look at? 1997 astro w eng 107000 miles thnks in advance

60psi key on engine off, (while the pump is running) is at the bottom of the specification limit, (60 to 66 psi). Hold pressure of 50psi, (55psi is desired) is also low but may be attributable to the low fuel prime pressure. Hard or no start conditions are typically not experienced at 60psi, provided all secondary ignition parts are in good condition, (plugs wires, distributor cap & rotor and coil). The combination of borderline parts could cause problems. Here are the guidelines for checking fuel pressure:

Fuel pressure is not monitored by the On Board Diagnostic (OBD) system and therefore cannot set a Diagnostic Trouble Code (DTC), or illuminate the Service Engine Soon (SES) light.

Fuel pump operation:
The fuel pump circuits are designed to energize the fuel pump through a relay continuously any time the key is in the START position. When the key is in the RUN position the fuel pump will operate provided the engine is running. If the engine stalls, or is not running for any reason, the PCM/VCM will shut off the fuel pump approximately 2 to 3 seconds after the key is turned to the RUN position.

Fuel pressure test:
Install the fuel pressure gauge to the test port near the distributor. Turn the key to the RUN position but do not start the engine. While the fuel pump is running, fuel pressure must be 60-66psi. After approximately 2 to 3 seconds, the fuel pump will shut off. Fuel pressure must remain between 55-60psi for several minutes. A drop in pressure below 55psi indicates a leak. The most likely place is the fuel pressure regulator, or the lines under the upper intake manifold.

Here is a link to an inexpensive yet ample fuel pressure tester: http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=92699