What should the fuel pressure be on a 2004 Ford Taurus with a 3.0

it could be an idle air control valve. Hold the throttle slightly open and see if that works.
Low fuel pressure would also cause this problem. Do you have access to a fuel pressure gauge? Fuel pumps are common, and restricted fuel filters could cause it too
A restricted catalytic converter would do it to. You can pull the upstream O2 sensor and crank it. If it runs then it means that the cat is clogged.

fuel pump or fuel filter needs replaced. sounds like fuel filter needs replaced first. then I would have a pressure check run on fuel pump to see if its working as advertised.

It could be a fuel system concern. I would check the fuel pressure with a gauge. You can check the fuel pump by sound.. if its coming on. Have someone turn the key to the run postion and listen near the fuel tank to hear a slight whine noise that will last about 3 sec. If you hear a noise..thats a good sign that power is getting to the pump...but the pump still could be faulty. If you hear nothing..its probably the pump. If you think its the fuel filter...just replace it...that's the best way to see if its the filter.

I would check fuel pressure before and after you crank the engine.
The pump gets power for 3 seconds during startup - if the fuel pressure has leaked down you would have to crank the engine until the oil pressure came up to get the pump to power up again.

2005 Ford Taurus maybe needind a recalibration of the ECM.For lack of power at highway speed,Misfire at load?low RPM also,The operation of a fuel pressure sensor is to limit voltage to the fuel pump when certain amount of fuel is not needed,and increase voltage when fuel is needed.If anything you need a recalibration of the ECM.

The fuel pressure regulator is on the fuel rail..But it sounds like to me like a stuck idle air control or a vacuum leak..Look carefully at all the vacuum lines and make sure they are not broke or crimped..If it stuck idling high you can tap on the valve and the idle will come down

It should be either on the rail, or by the rail on one of the fuel lines. Hope this helps, James Booth

Check the fuel pressure first to find out what the fuel pump is doing.

SECTION 310-01: Fuel Tank and Lines 2004 Taurus/Sable Workshop Manual REMOVAL AND INSTALLATION Procedure revision date: 05/25/2004 Fuel Filter — Early Build Vehicles Printable View (105 KB) Removal and Installation

1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to Section 100-02.

1. Release the fuel pressure. For additional information, refer to Section 310-00.

1. Disconnect the battery ground cable. For additional information, refer to Section 414-01.

1. Remove the fuel filter.
   1. Push the release buttons and disconnect the fuel tube quick release couplings from the fuel filter.
   1. Loosen the clamp.
   1. Remove the fuel filter.

1. CAUTION: Make sure the fuel tube clicks into place when installing the tube. To make sure that the fuel tube is fully seated, pull on the tube.
   To install, reverse the removal procedure.

fuel pressure at the fuel rail test port should be at least 44 PSI, when u gun the engine it shuld go up very quickly, it should never drop, if it does the fuel filter is either plugged or the pump is defectuive