98 GT low fuel pressure and stuttering whe driving
 

So recently my car started stuttering and having a rough idle. I cleaned the MAF sensor and replaced the TPS. I am about to replace my passenger side upstream o2 sensor because it shows the P1132 code on bank 1 sensor 1.
I just put on the fuel pressure gauge on the fuel rail. When I turn the key, I can hear the fuel pump prime for 1-2 seconds but the gauge shows 0 psi with the engine off. The gauge shows around 30 psi when the engine is idling.

What are the fuel pressure specs with KOEO and when idling? What's a good way to test whether it is a bad fuel pump, filter, fuel pressure regulator or leaking fuel injectors?

Pick the low hanging fruit first. If you haven't done so already, replace your fuel filter.