i have a 94 gmc sonoma 4x4 ext cab 4.3l v-6 vin letter "w". i replaced the fuel pump, fuel filter, im getting fuel to the motor, ive done a noud test from the wire connecting to the spider injectors and its good. i have fuel coming in but not going out. wut else can i do? wut could possibly be the reason why the truck isnt starting?