[Steve Tinker]

1) Lock / unlock the car 2-3 times to activate the security system.

2) Now make sure you have a good spark at the plug. Remove one of the coil packs (the easiest to get to), plug in one of your original spark plugs and get someone to crank the engine while you hold the plug body onto the engine. I suggest you wear gloves or use insulated pliers to minimise electric shocks.
If no spark there is a bigger problem than flooding.

2) If you have spark at the plug, do as per jdlmodelt suggests and push the throttle fully open while cranking the engine for 10-15 seconds - you should get it to fire on a couple of cylinders but keep the throttle wide open until its firing on all six.
This has worked for me in the past after shutting down the engine after a few seconds running.
Keep us informed of the outcome....