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On a trip back home from work my 2005 ford escort experienced a loss of power on hills which required me to accelerate to high rpms to regain some amount of power. It also stalled while driving and stalled at a stop a few times. I just read the codes and have P0171, P0191, P2004. I started the vehicle and let it warm up, shut it down and started again with the following codes showing up: P0171, P0191, P0304, P0316, P2004. Is there a sequence of attack to solve this issue. I also just changed the valve cover gasket, boots and plugs because of oil from the valve cover in the spark plug wells. Any direction would be greatly appreciated.
 

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2006 ZX5 2.0, 2004 ZX3 SVT EE. 2004 ZX3 SVT
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Fuel rail pressure sensor is bad or the vacuum line is broken. It is on the fuel rail in front of the valve cover.
 

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Fix codes in the order they appear, often it can fix later ones too. Early code often causes the later one.
 
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2006 ZX5 2.0, 2004 ZX3 SVT EE. 2004 ZX3 SVT
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Fix codes in the order they appear, often it can fix later ones too. Early code often causes the later one.
The first 2 are key. Lean followed by the fuel rail pressure sensor.
 

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Maybe I should have said.......Early code often causes (or can lead to) the later one.

Sometimes the fault is not hard although popping codes, it then turns to a hard fault in the process.

Anyway, the general idea is to define all codes then look for which ones can cause some of the others, you may end up with more than one group of associations there.
 
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