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look into the fuel filter or the intake gaskets, if the fuel filter is plugged that will cause low fuel pressure, and if the intake gasket is gone it will draw air into the engine after the MAS and give false readings and then the computer will try to adjust for it and it will cause all kinds of the problems you are describing.
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.
That is P0191 not o. P0191 FORD - Fuel Rail Pressure Sensor Circuit Range/Performance
Possible causes- High fuel pressure - Low fuel pressure - Damaged FRP sensor - Excessive resistance in the circuit - Low or no fuel - Wiring harness connector of the fuel pressure sensor - Fuel Rail Pressure Sensor -
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
Find a shop that does scope meter testing. They will be able to give you coil's output.
You may have a faullty plug wire . Take a spray bottle full of water spray it on spark plug wires and see if the engine decreases in idle. If so you need new wires.
With regards to eng lite. have ECU scanned again may be a different code. Autozone does this free of charge.
Did you clean out the carbon on the EGR passage before you put new EGR in?
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