I have a 1995 Mustang 3.8 V6 and one day it blows the fuse to the fuel pump then about three weeks later it blows the fuse to the ECM/ fuel pump and the fuel pump fuse blew two of them so I figured that the fuel pump was straining and it was blowing fuses so I changed the fuel pump and the fuel filter and then it got to where it would not run like it was starving for gas so I tested the mass airflow sensor and it tested good but I bought another one and put it on then I tested the IAC valve it tested good but I bought another one I put on it when you try to rev it up it revs up but it does not give full RPM and it like backfires inside the motor and it just acts like it is starving for gas I tested with a fuel pressure gauge I tested the fuel pump and fuel pressure regulator the fuel pump says it needs to be 30 to 40 at an idle with vacuum on and 40 to 50 with the vacuum line off when I pull the vacuum line off it jumps up the 40 I don't see no leak in the pressure regulator it seems to me that it runs better with the vacuum line off then it does with it on and it is sucking vacuum to the hose pretty good but I was wondering if you might think my next step would be to check the Cadillac converters you can't even put it in drive and it goes nowhere just goes dead but it cranks right up sometimes it run for a few seconds and go dead and sometimes it'll run for 10 minutes before it goes dead or as long as you keep giving it the gas it'll keep running but it just act like its starving for gas and sometimes it will backfire inside the motor if you have any questions don't hesitate to ask and I will try to fill you in as best I can
Don't rule out a faulty distributor module either or an issue with the ignition coil. Have you tested the spark with a spark tester, or inspected the spark plugs for fuel fouling?
do pressure test the cats, but that wo't blow fuses. On those, often a bad main computer will do that IF you already changed out the fuel pump. if not, change the pump first