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Up until 2002 the fuel pressure regulator was vac controlled and mounted in the fuel rail on the intake manifold. After 2002 I think it is part of the fuel pressure sensor which still mounts on the rail. You may have to check with the dealer to see which version your engine has.
Start by having the computer scanned for codes the codes will telling if theres a problem and can help alot, the car may have a bad fuel preasure regulator where extra fuel is going to engine which makes it hard to start and rough idle, remove the vacuum hose from fuel preasure regulator and start engine if fuel comes out of the hose connection of regulator then replace it.if the regulator is good then go have codes pulled, hope this helps.
probly hav a wiring issue--also chec fuses and relays--inspec fuel pressure regulator in engine area--try to get a diagnostic scan from a mobile mech--a haynes manual is a must for detailed troublshootn
the first thing is to scan the computer to locate the cylinder thats misfiring, the next thing would be to have the fuel preasure tested, as it seems like you may be loosing fuel preasure, this can be caused due to a bad fuelpump a clooged fuel or a bad fuel preasure regulator, when you feel the car misfiring remove the vacuum hose to regulator and make sure theres no gas leaking from regulator where the vacuum hose goes, hope this helps, also i would try a fuel system motor vac this clean the injectors and removes carbon build up.good luck.
you may have a bad fuel pump or a bad injection pump,here are picture of the two, as far as the gauge you may have a bad fuel sending unit, this is in the tank and work like a toilet float and sends a signal to the gauge, the injection pump and fuel pump are located on top of motor you would need to have the preasure checked on both before just replace them hope this is helpful.
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