Engine Performance problem
1990 Chevy Lumina 4 cyl Front Wheel Drive Automatic 130000 miles

what might cause my fuel pressure regulator on my 1990 chevy lumina to keep malfunctioning? I t was only starting with pedal to the floor and only stayed running in gear if i kept giving it gas then eventually didnt start at all. i replaced fuel pressure regulator and it was fine for a day now it is doing it all over again