Pilot is warn and allowing excess gas located pilot light gas adjustment on the gas valve and adjusted pilot which corrected the issue during service noted that heat exchanger is heavily rusted and informed customer that the furnace is near end of life and would not reccomend heavy investment in parts for the furnace due to age condition and availability of parts, Nate already prepared a qoute last year for furnace when servicing a similiar issue performed combustion analysis and cycled furnace operations are normal.