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This is the first place I would look, as mentioned earlier, the fuel pump can be very large and it should still have whatever fuel pressure that the regulator dictates.
a super larger pump with a tiny 1/4 return line wont let the fpr do its job. you will get a false fp reading.

99% of drivability issues are fuel related because everyone things the throttle stop screw is idle adjustment on stock eec iv mustangs
 
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