Just my 2 cents worth
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.