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Furnace is blowing but gas is going off and on all the time

\015 1993 Rheem gas unit. Motor starts to blow and flames come out strong. Will blow for a few minutes and gas will shut off but unit keeps blowing. Flames come back on and cycle keeps repeating. Takes forever to warm the house even a few degrees. Unit looks to be in perfect condition, just out of the box. No signs of rust or other aging problems. Replaced a very old digital thermostat with new digital one. Problem still exists.\015

Answers :

Check the heat anticipator on the stat if its a manual one

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