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The reason why the engine won't start with starting fluid is probably a faulty crank sensor or its circuit. Both the ignition module, as well as the main computer, need to see a crank sensor signal that tells them the engine is being cranked by the starter before they will fire the coils and injectors.
To test the crank sensor/signal:
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Hi again. If it's getting spark, then it should start and run momentarily with starting fluid. If it doesn't, check valve timing by running a compression check - should have about 150 psi on all 6 cylinders.