If it cranks good but won't start, check the basics if you haven't already. Have a helper crank it while you check for spark at the plugs. If spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse. Check cylinder compression.
Can you communicate with computer? Unplug a sensor and see if it will set a code? One way to see if computer is awake is turn on the key, check any sensor that has a ref voltage. If no ref voltage have to check voltage and grounds for computer.
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