The fuel pressure needs to remain up between starts. Fuel pressure dropping to 6 PSI in a few seconds after shut down indicates a leak somewhere in the system. The usual leak locations are:
- fuel injectors not closing/sealing fully
- fuel regulator or pressure sensor (FRPS). Check the intake vacuum reference line for raw gas.
- fuel pump one way check valve.
- leaking flexible fuel line between the fuel pump and gas tank hat.
If a fuel injector problem is suspected I have had great luck with an injector cleaning and flow test service such as InjectorRX.com. Once cleaned and tested they are as good as new but cheaper.
As a short term work around try cycling the key on/pause/off a couple of times to see if this improves starting.