Get yourself a code tester and run the cylinder balance test. It'll give you some indication if maybe you've got a bad injector. Also, I had a FPR go bad once that hissed terribly because the fuel was making it past the diaphram and actually being sucked through the vacuum line and into the intake. Check to see if you've got raw fuel in the vacuum line. Might also check your vacuum at idle.
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Jeff Chambers
1990 Mustang GT 10.032 Seconds / 137.5 MPH
14-time Street Warrior World Record Setter
CRT Performance
2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH
2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2
"There's nothing boring about a small block automatic shifting gears at 9400 rpm!"
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