Question from user Winter_Wookie at hvacadvice at reddit.com.

Answer:

Adjusting the gas valve didnt work because you fail to understand why its failing. Its not carrying the flame over. You need to clean out the entire unit with compressed air to get the dust out of the flame carriers.

Answer from user JudgmentMajestic2671 at hvacadvice at reddit.com.

intermittent fail to fire