Im pretty sure its not the trans, had a grand am that had that problem, torque convertor stays locked in and when you stop feel like you forgot to push the clutch in car bucks and stalls.
I have another idea and let me know if this sounds right or if i'm way off base. Since the fuel pump activates for about 3 seconds when you first turn the key on to pressurise the fuel rails and the car will start for about 2 seconds and then immediately dies. Could it be something to do with what controls the fuel pump once the computer recieves a tach reference signal? Crank sensor? cam sensor? ignition module? I would bypass the fuel pump relay if i knew which one it was. Being a park ave there are about 10 relays under the hood.
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