Checked for loose grounds? Any diagnostic codes? You didn't try to clean the AFM did you?
To ensure it's not the fuel pump's power, jumper FP and B+ in the diagnostic box and then try to start... if it runs then then you need to diagnose the fuel pump's circuit. This won't tell you if the fuel pump is too weak though, for that you need a gauge; Even a weak fuel pump could give enough fuel pressure for a car to idle.
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