Engine Timing

If it starts for a second on starting fluid, that indicates a lack of fuel getting to the cylinders.

Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.

Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

Run the test I asked you to run.
Pull a couple plugs and see if they are getting fouled also.

The last thing you want to check is compression if fuel pressure and injector pulse are good. Don't guess. Use a pressure gauge.

Your test results are not adding up. See how strong your spark is. If you have goo spark, it should be running with those test results.