I went to drive my mustang out the parking lot when it just all of a sudden died. i ran some test and from what i can tell, it has spark. it would fire up for a second and die. barely make it to idle. now it wont even fire up. i changed the fuel pump to a 255lph walbro, replaced the ccrm, pulled the two fuses under the hood that i was told are the fuel pump fuses, checked the inertia switch which was unplugged. i didnt use a voltometer on any of this, as i dont havw one nor am very familiar with how to use one. So after all this, i still cant here my fuel pump prime and the car still wont fire up. any help is appreciative. thanks in advance.