It seems that if you tried that many brain boxes, one of them would have worked.
Here are some things to check. (I am assuming you have gas in the tank, the battery is good and the engine cranks over but doesn't catch and run.) Perhaps one of these items was overlooked in the trouble-shooting:
Engine cranks but won't start:
Charcoal canister full of fuel, faulty MAP or MAF sensor, faulty engine coolant temp sensor, faulty EVAP canister vent valve, EGR valve stuck open, lack of or incorrect fuel pressure (fuel filter, fuel pump, fuel pump relay), water in fuel, fouled spark plugs, faulty ignition module, severe vacuum leak, severely clogged fuel injectors, wrong size o-rings on fuel injectors (prevents compression), faulty airflow sensor (if equipped), Idle Air Control (IAC) valve defective, disconnected-broken-loose wires for all of the above.
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