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By the symptoms you are providing, this sounds like the board is not getting a clear signal that the flame is present, so it is going into shut down mode, then resarting. You first should clean the flame sensor. NOT the ignitor. Use some steel wool or fine sandpaper and lightly clean off the carbon from this sensor. Let me know if this fixes it.
Just a quick follow up to see if you have had a chance to clean the flame sensor or if you have any follow up questions or more info on your problem.
Ok Thanks for the reply. I will be waiting to hear what you have found.
Ok, just let me know if you have further questions.
I will opt out and it will open to other experts. Intermittent problems are very hard to diagnose.