You need to do some very basic tests instead of replacing thousands of dollars worth of parts. Test to see if it is spark, fuel, or mechanical. Take the spark plugs out and lay them on the head all hooked up to the coils. Turn the key to start and watch what happens. Are they all sparking and continue to spark? If yes, then then I would head for the throttle body. Take the air intake off and look in there and turn the key on. Do you hear it work and see it move? If not, then that may be the problem. If it's not sparking, check to see if there is voltage across the black and red wires on the coils. If not, then check the ignition 1 relay to see if it's turning on. You have to pinpoint what system the problem is in.