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As I have been down this road before, let me tell you that there could be allot of time involved in figuring it out.But lets try!I will try to answer any questions that you may have.If you post the results I will try to help you until you get it going.
That's probably the small diaphragm in the front of the fuel rail with the vacuum hose on it, I think that is supposed to do that.
That's odd, fuel pressure should remain stable or drop slightly, but not spike, tho50 PSI isn't really enough to cause too much trouble, unless the pintle is havingtrouble lifting in the injectors from the pressure increaseWild
also check your fuel line size(has to be large enough) and take out the little plastic one way valve by the tank.