I'm having some trouble with my stock 4.6. When I go to start it in the morning,it starts up and immediately stalls. Usually the second crank gets it going fine. The car idles fine.The next problem is that if you get into to loud pedal with any authority, it will stumble and sometimes backfire. Even after it is warmed up the car will not function when mashing the gas. It falls flat on it's face.The car acts like it's either getting too much gas or not enough. If you back out of the pedal it will start pulling around 1/2 throttle. I pulled some codes and they all have the same theme...EGR control not having adequate voltage. Too low. Has anyone had a problem like this. Help would be appreciated. I'll be cleaning the mass air meter tomorrow. One more question that might be related. If you put vacuum on the fuel pressure regulator,with a pump, should it hold vacuum? Thanks in advance..