Thermostat Calls for heat, inducer runs, ignitor starts to glow, but then it stops, then tries again and again while a clicking sound keeps happening each time it starts to glow. Eventually glows long enough to call for gas and all is normal until next cycle, where process happens all over again. American standard high efficiency

Check pressure switches to see if they are opening when the glow plugs fails. Lots of things that could cause this, but I would start by testing pressure switches.