Re: Are these injectors original?
Chris,
50 psi fuel pressure at idle is too high. 43 psi +/- 1 psi is normal at sea level. Don't worry about it with respect to the stumble problem though. High fuel pressure at 50 psi won't cause a stumble, misfire or roughness.
Maybe you have a shorted secondary injector causing the stumble? Check their electrical resistance. As they approach 6 ohms they stop flowing.
Dominic,
The Ford injectors have a different physical shape than the Accel injectors. I don't know who manufactures either one.
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