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It sounds to me like your injectors are not opening--in other words not getting the electronic signal. So I'd work the problem from that premise if I were doing the diagnosis. This opinion is based on your observation that the car will start with fuel inserted manually into the air horn. This tells me you have spark.

Your next step should be a "diagnostic tree" wherein you sketch out how your injectors get their signal--which relies on a number of components. Here's a start for you but I'm not sure this is your problem.



Starting Mode:When the ignition is first turned "ON," the control module turns "ON" the fuel pump relay for two seconds, and fuel pump
builds up pressure. The control module also checks the coolant
temperature sensor and the Throttle Position Sensor (TPS) and
determines the proper air/fuel ratio for starting. This ranges from
approximately 1.5:1 at -36°C (-33°F) to 14.7:1 at 94°C (201°F) engine
coolant temperature. The control module controls the amount of fuel
delivered by changing how long the injectors are turned "ON" and "OFF."
This is done by pulsing the injectors for very short times.

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