1989 Trooper 2.8 V6. Was running good, then got hard to start. Have replaced fuel pump and filter. I now have fuel to the throttle body, but won't go through. My question is, how likely is it to be the computer, the injectors, or the electrical leads to the injectors. I do not know how to test any of these. Any help would be appreciated. I want to keep and drive the car, so I really don't mind fixing it. I just need to know where to start. Thanks, Jay