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have you tried swapping out the DME relay? The DME relay contains 2 relays, one of which powers the DME computer, the other the fuel pump. As they age/wear, the DME relay can develop cold soldier joints that can cut of their circuits (and "magically" heal once current/vibrations close the gaps) -- in your case, sounds like the DME relay isn't activating the fuel pump, but that the cold soldier joint is closing after the engine's run for a bit (via starter fluid) -- Another interim step, if you don't have a spare DME relay yet, is to tap the DME relay (it's under the driver's seat) while trying to start the car and see if that causes the fuel pump to activate/engine to start. It's also worth checking whether your '84 still has the old style single wire Cylinder Head Temp sensor and replacing it with the newer (and more reliable) 2 wire version if it does.
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