The P2004 is an intake runner stuck open control bank 1 issue. Using a flashlight, check the right side of your IMRC as it's likely that one or more of the bushings has deteriorated and one or more control arm is no longer attached.
You can replace these by getting a pack of bushings that come in 6 or 8s, and using a long screwdriver with a piece of backwards facing tape, simply pop a new bushing into the hole and pop the control arm back in to the new bushing.
Ford Freestar was created in 2004.
2007 ford freestar
A code P2004 in a 2006 Ford Freestar indicates a problem with the intake manifold runner control (IMRC) system. Specifically, this code means that the IMRC is stuck open or has a malfunction. This can result in poor engine performance, reduced fuel efficiency, and possible stalling. It's advisable to inspect the IMRC components, including the actuator and wiring, for any faults or obstructions.
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( 26 U.S. gallons ) for a 2004 Ford Freestar
One reason a 2004 Ford Freestar may stall out is because of a water damaged PCM. This is a common problem with the 2004 Ford Freestar.
On a Ford Freestar : ( NO ) * according to the 2006 Ford Freestar Owner Guide , up to ( 2000 lbs if the factory trailer towing package is installed )
The p2004 code means that the intake manifold runner is stuck open. I am trying to figure out how to correct this in my 03 Ford Ranger 2.3L right now without having to take the manifold off. No luck so far.
2005 Ford Freestyle
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According to the 2004 Ford Freestar Owner Guide : ( 26.0 U.S. gallons )