My 1998 Jimmy SLE 4.3L is having issues starting. The vehicle will start but then stop when it settles down to the idle rpm. When i turn the key I get a fuel pressure of around 52-54psi and i can hear the fuel pump running. The odd time when I can get the vehicle to run I get a fuel pressure of 55psi and the engine runs better than it ever has. Since the problem started I have changed the following:
Cap and Rotor
Spark Plugs and Wires
PCV valve
Fuel Filter
No codes showed during a scan and the problem occurs often but occasionally it will start without a problem. My last thought it would be a fuel pump or a fuel pressure regulator. Again, I can hear the fuel pump activate when i turn the key and the fuel pressure is just below 55psi when i turn the key. Any help on the problem would be greatly appreciated