Double check, then triple check, the coil firing order, I still get it wrong after 35 years.
All fuel injected computers have a program to clear a flooded engine.
You turn key on
Press gas pedal to the floor and hold it there
Engine should now be turning over with spark but fuel injectors are shut off.
TPS(throttle position sensor) outputting maximum voltage(4.5v, foot to the floor) before cranking "tells" the computer to shut off fuel injectors.
What I would do is to pick an easy to get to spark plug, remove it and clean and dry it, then re-install it.
Now crank engine as described above, with injectors off.
Do it a few times, if engine tries to start then it is getting fuel and shouldn't be, so there is a problem, see below.
Pull that spark plug back out and check it for fuel, if it is wet then you have a leaking injector, or a bad Pulse Damper.
Pulse Damper is at the end of the fuel rail and will have a vacuum line attached, pull off the vacuum line and check it for fuel or fuel smell, if there is fuel or smell then it has a hole in the diaphragm and needs to be replaced.
If no smell then leaking injector.
The Fuel injectors all get 12volts when key is on, the computer opens an injector by Grounding it, there is one ground wire for each injector running back to the computer, so 6 ground wires on a V6, if one of these wires gets chaffed and gets grounded then that injector would be open whenever the key is on.
Last edited by RonD; 03-18-2014 at 11:02 AM.