1994 Ford Taurus 3.8 won't start?

So my 94 Taurus with a 3.8 liter won't start. I changed the plugs, wires, cap, and rotor. It'll start and run just fine now as long as I keep spraying starting fluid in the intake. I changed the fuel pressure regulator because the diaphragm in that was bad. The fuel pump comes on and if I crack the bleeder on the fuel rail I have pressure. Any ideas? I had a small misfire the other day and then it just wouldn't start anymore.

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