i went away for the weekend and my moms durango got a misfire, ended up being a bad wire from the pcm to the 7 coil replaced it and it was fixed. Also I replaced all the spark plugs. went to take it on a test drive and it died about 10 meters from my driveway, it started back up but then died a few seconds later. i tried starting it on quick start but nothing. sometimes the dash and the Obd2 port will connect to the ecm and sometimes it doesn't and sometimes the gears on the dash were all lit up,
there is a engine light but it is for a oxygen sensor.
the fuel pump doesn't make any noise and there is no fuel pressure at the fuel rail.
there is a noise from the back when i put the ignition on but today the disc changer is going off when ever i connect the battery going insane but the radio still works.
the power windows on any door don't work but the locks do.
the overhead display is reading -40 degrees

any help would be a welcome thank you