The engine cranks but, only runs for few seconds and shuts off?

1988 Nissan Stanza wagon mileage: 193,000. I adjusted my valves last week. In order to remove the valve cover I had to remove a bracket at the back end of the engine. I crank the engine over to adjust valves (with both coil wires disconnected). When I went to put the bracket back on, I noticed there were two ground wires connected to one of the mounting bolts. I later found out one was a ground for my fuel pump; I still do not know what the other is for. Once I got everything back together, the car would crank but, run for only a few seconds and shut off, as soon as I retry, it does the same thing. I did find that I had a clogged fuel filter but after replacing it, the car still does the same thing. I have checked the fuel pressure regulator, it seems to be firing fine and I checked the injector wires with a Noid light. Not a whole lot in print on the Stanza. I have Chilton and Haynes repair manuals. Not very good wiring diagrams on the EFI system. Next to the dealership what are my chances? I like the old car I hate to junk it. But, I don't want to spend a lot of money to get it fix.