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: 1995 Fuel Pressure Regulator dmorford 07-20-2010, 06:46 AM What are the symptoms of a faulty fuel pressure regulator. My car is running very rough (galloping at an idle). The fuel pressure is 41 psi with switch on and engine off. While running the fuel pressure varies around 38 psi. wayback 07-20-2010, 08:18 AM Sounds like it is fine. Bad reg will have high or low fuel pressure. Yours sounds normal to me, but what do I know. C4 Gurus chime in!! vetteoz 07-21-2010, 02:54 PM My car is running very rough (galloping at an idle). How old is your Opti spark ? | |