The fuel pump relay has been changed and will run fine then after sitting over night it will do the same thing.
33 years old could be the problem. I am sure many things have been changed on it. But the constant is the electrical/wiring system, Most likely shorted. Vacuum probably isn't right either.
The "check engine" light is on to tell you that there is a trouble code stored in your truck's computer. Most parts stores will read the codes for you for free. Get that done, and you will know what part to replace.
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