car runs rough

FORD MUSTANG
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JORTIZ9758
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I have a 1993 ford mustang gt. I was running low on gas one day and right before I got to the gas station my car was hesistaing and kinda backfiring. I thought it was because I was low on gas . I put gas in it ..and no help. I have since changed the fuel filter and in tank fuel pump..and still nothing. I have a fuel pressure guage on the car and it reads 20 psi....my car should run at about 42 psi (supercharged).

Now the thing is if i disconnect the mass air meter the car runs fine...( I have changed that out also)...but still only runs on 20 psi.

Could it be my adj.fuel pressure regulator??
I cannot increase fuel pressure.
Dec 31, 2006 at 12:52 AM
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SERVICE WRITER
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When you unplug the MAF, the fuel pressure comes up to spec?
Jan 1, 2007 at 9:39 PM
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JORTIZ9758
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No it does not.....
Jan 2, 2007 at 1:23 AM
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SERVICE WRITER
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If the pump is not within specs, it won't run right. Sounds like a new pump is in order.
Jan 2, 2007 at 5:43 AM
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