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It shouldn't and it may indicate that the LP pressure is too low. If you haven't had it checked and adjusted in the last year then you should have it checked. Be sure they check for "honey" in the line as that will cause the flame to go up and down as you describe. Have the line at the tank drained out. It looks like used motor oil. Check those things and then get back to me if you need more as all follow ups are included in our fee. R.J.