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You have a small air compressor?
Are there movable adjusters (shutters) for air (primary air) on the inlet of the burners? If so are they all in about the same position?
Has there been a furnace cleaning company in recently?
Take and blast (when the furnace isn't firing... Lol turbo furnace!) some air down the burners tubes. Try not to move the adjusters or mark where they are.
It is possible that your gas valve isn't fully picking up too.
__________________
Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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