[HayZee518]

if you have a flame rod flame sense, this is integrated into the electronic ignition. there's a purge cycle for so many cycles before the control locks out. white - rogers makes a replacement ignition control with plug in cycle timers. your on-off cycle would indicate to me that the pilot keeps going out, then re-ignition starts. if you have a meter I'd connect it across the primary gas control solenoid and watch what it does when the main burner kicks in. if you lose the voltage while the burner fires, then I would suspect the flame sense electrode.