I have heard two professional Z mechanics (one I've used and the guy on the ZTherapy fuel injection video) state that fuel pressure regulators hardly ever go bad, yet they are the first thing everybody (including me) replaces when the car doesn't run right. These mechanics both also state that 95% of the time, the problem is either electrical or a vacuum leak. If you want to spend $60 for a new one, go ahead, but maybe you should try cleaning contacts and testing various sensors before you do.
true fuel pressure regulators seldom go bad. but most will stick shut fuel pressure will be in the 50 to 60 range and pump will make a noticable whine (pressure relief valve in pump). the other failure is the diapham to rupture in which case so much fuel will be sucked down the vacume hose as to almost instantly flood engine and drown plugs to point of having to be clean before they can work.