Does it not fire at all full stop? I'd be verifying none of the ignition components are heat sensitive (it'll run as there is cooled air being blown through with the engine running.... switch it off and you have heat soak get into everything).

I'm assuming you'd know if it's flooding 'cos it stink like buggery of fuel even before you try to start it. Next time pull a plug lead and see if you have spark before you start chasing your tail in circles

seeya,
Shane L.