research whats the correct voltage on the coil. does it have a resister in line, or is it suppose to be 12 volts. check voltage drop when cranking like nubs was asking.What is the voltage at the igniter when the engine is turning over? what is the voltage on the battery when the starter is engaged?
there is something simple causing it not to fire in my option or the new igniter is bad. There was a guy on here a while back that was pulling his hair out and it ended up being a bad battery, just because it turns over does not mean there is enough voltage left to power the igniter