No flame lift. its almost like worn brake pads on your car when it first kicks off for about 10 seconds then the rumble comes in for a short time and the pressure needle flickers, then dies off and settles down. Also something i didnt mention in my first post, they have just finished putting in a new gas main outside our house, and the rumble has been happening for only a few weeks but i thought it may just be a coincidence. Hope this helps.
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