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Did it just start or have you had this problem for awhile?
I'm sure the people here can help you fix the problem but we are going to need a lot more details.
I see this is your first post here, when you get a minute would you do us a favor and go to "Roll Call" and introduce yourself so we can get to know you and give you a proper welcome, also would you add your location to your profile, we like knowing where you are when we talk to you, Thanks!
ramchaney, afternoon and welcome to the forum.... I have seen this condition once... In a Charmglow BBQ that was natural gas fired, the lid sealed so tight, there was no air flow through the bbq... I would light it and in about 10 minutes the flame went out.... If I cracked the lid about 1/8 inch, everything was fine.... I figured the bbq filled up with hot air with no oxygen until it got to the air inlet of the burner... that is a SWAG... (scientific wild a** guess)... all gas burners need good air flow thru the heating chamber.... Open the top vent all the way and leave the bottom vent open also.... Let us know what you find out... Dave