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It sounds like the regulator is the problem unless you have a major vacuum leak preventing enough engine vacuum to reach the regulator or the vacuum hose is damaged or disconnected. The fuel pressure regulator (see picture 1) is attached to the fuel rail downstream of the fuel injectors. It regulates fuel pressure supplied to the fuel injectors. The regulator is a diaphragm-operated relief valve. One side of the diaphragm senses fuel pressure and the other side is connected to the intake manifold vacuum.
Picture 2 shows pressure specs.
Do me a favor. Remove one of the spark plugs and inspect it. Is it wet? If so, replace the regulator. Also, please keep in mind if that is the case, raw fuel may be entering the catalytic converter which will cause damage.
Let me know if I can help in any way.
Take care,
Joe
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Sunday, April 14th, 2019 AT 3:12 PM