[SilvrEclipse]

The fuel filter would be good to go ahead and change if it hasn't been done in a while. I wasn't aware that we had fuel temp sensors on these cars. You really need to get a fuel pressure gauge hooked to that rail to see whats really going on. Its really rare that a fuel pressure reg goes bad but the fuel pump might not be supplying enough fuel to built the pressure the system is looking for. Or maybe a really clogged filter could do this also.

What kind of fuel pressure tester are you using? If your having problems with that valve at the end of the rail you can remove it while your checking the pressure. Just use a tire valve removal tool.

One way I always diagnose a fuel problem is to use starter fluid to crank the car on. I spray starter fluid in the intake pipe and once the motor starts a bust of fluid every second or 2 will keep the motor running smooth. If the car runs good then you deff know its a problem with fuel delievery.
WARNING: this can be dangerous is not done carefully. An intake backfire could shot a fire ball out of the intake pipe so be careful if you decide to try this.