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There are a couple of things that can be tested before replacing them.
Have the mass air flow sensor tested, and have a fuel pressure test done, there might be a weak fuel pump and/or faulty fuel pressure regulator.
TO replace the fuel pump, remove the gas tank. When replacing the fuel pump also replace the strainer on the bottom of the pump and replace the fuel filter.
The fuel filter should be on the frame rail on the right side below the passengers door area.Just follow the fuel lines from the motor or the fuel tank.
I would have a pressure test done on the fuel system. the fuel pump could be going out. also does the check engine light come on, if so can you get the codes checked?
the fuel filter is located on the drivers side under neath where the rear seat would be connected to the frame. relieve fuel system pressure,disconnect negative terminal from the battery,raise rear of vehicleand support it securily on jackstands,detach fuel lines from the filter,some have quick connect . squeeze plastic tabs to pull the connector apart,if it has threaded fiting unscrew the fuel line from the filter.
look over rear end it is by the gas tank .you need to spray the fittings with wd40 or P B blaster it works alot better than wd40 to help loosen the fittings start by pulling fuel relay under hood in fuse box start car this will relive fuel pressure you will need 2-15mm line wrenchs for one end of filter the other you squeeze the fitting and pull out filter
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