Car dies and won't start without starting fluid

Then can the computer make all of them not to get fuel and then sometimes work just fine? Not sure why waiting from 5 to sometimes 20 minutes and it will start again. Maybe cooling off has something to do with the injectors working. This is why we're confused. Can a faulty computer be causing this whole problem. We will check the injectors as described on this site under how to test fuel injectors. If it's the computer malfunctioning here and there, we might not find the problem by testing them. I'm wondering, this does die on my dad going down the highway or even in town. He has let it sit for some time and got it to start back up. Once he got it running, he shut it off thinking it was ok then. When he tried to restart it, he had to wait again before it would start. But if he sprayed starting fluid into the aircleaner, it would run until the starting fluid was all used. But sometimes it kept running. Even telling the shops he's taken it to, I don't believe anyone has ever considered it might be the injectors. That's why I was wondering if the computer sending trigger pulses of juice, just might be faulty, and working intermittently. Is there a way to test the computer, or narrow it down to that itself. I really appreciate all your help, but we've put out so much money already, and haven't gained a thing from all the shops it's been in. My dad, at this point, doesn't want to spend another dime. He's quite old, and feels like all these shops are ripping him off. That's why I stepped in and am trying to help. He doesn't have a computer, or even knows how to get online, so I'm doing it for him. Hope you can maybe give us some light on this subject. Thank you so much.