Fuel injection 1990 Chevy full size Blazer 350 TBI I have been checking everything to with no sceuess?? I have looked at the EGR Vaul plugs ,dis, wires, rotor, fuel,. Still nothing

I called my Macahnic and he said could be a whole lot of things and need to hook it up to a computer. But heres the kiker I do all my own stuff at least 90% But when it comes to this stuff I am lost. And he is 60 miles away!! I use to use him when ever I had to and he is a great guy but when I moved to the cape 7 years ago I lost him. Now I don't no who to trust??? And I don't trust most so now I have no Idea what to do?? Burning it sounds good to me rt now
I have a guy that is going to try to get over to my house tonite or tomorrow with a puter to ck it with. But this leaves the family at the Camp grounds alone with no car. O well what you going to do?