Well this can and will be a long session, The fuel if not treated with a stabilizer has varnished the internal works of the fuel system, you may even have to replace the fuel sending unit in the tank. So lets start at that point if it dose not work it will be because of varnish, and you need to change it. next the fuel filter, change it. The injectors are going to be next, pull them and send them to a shop to be cleaned. next check the plunger in the f/d see if it is stuck. Though if I where you I would send the f/d out for rebuild. Once you have the fuel system back in operation, you will need to check the electrical components of the fuel system, The EHA, The potentiometer, The oxygen sensor.I know this is quite a list but you will even need to pull the entire intake manifold down and replace all the rubber parts and the idle air lines. doing this at the time you are having the fuel system reworked will be the best time. You will have a long enjoyable care free ride. JNT