My 1992 chevy lumina APV 3.1L runs great. But, once you park it for a short time, it stalls upon re-starting. it will start right up, but sputters and stalls many times. if it sits for a long time, like overnight or while i work all day, it starts right up and runs fine. we have changed the fuel filter 2 times. it acts like it isn't getting any gas.
Here are some signs of a bad fuel pressure regulator: the vehicle runs rough, the engine will not start(usually in morning) MANY TIMES ENGINE STARTS BUT STALLS SHORTLY AFTER STARTING. a bad regulator can result in fouled spark plus, and fuel milage will decrease noticeably. the only cure is to replace regulator. what makes it fail usually it gets a tear in the diafram and it cant maintain fuel pressure. hope this helps toolman,
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