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This is Scott at any time is the light flashing a code indicated by a pause in the flashing and at anytime does the new ignitor glow.
Well at least we know by the fast steady flash that the thermostat is sending a signal to the unit, also you say the inducer/draft motor is running correct?
It appears that the pressure switch is not pulling in and continuing with the cycle of the furnace, do you have a multi-meter at your disposal Phil?, if not you can turn the power off to the furnace and back on again to recycle it ad whil it is running tap the pressure switch. also you should make sure the exhaust and inake pipes are clear.
If you have a multimeter you can do an ohm check on the igniter to test its integrity.
If the igniter is indeed bad that is in there after the draft motor starts you will here the gas valve click 17-40 seconds after the motor starts. you can also test for voltage at the recepticale for the ignitor. Great Phil just repond later and let me know how it turns out for you.