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1) Unplug and reconnect the white molex plug connectors from the board. Male-female plug connectors as you may have a poor connection. Look at the pins inside them with a magnifying glass as one may be pushed back and not seating.

2) Check the wiring connections at the board

3) Jumper R-W and run it. If it works good then the tstat may be dropping out or flickering

4) Make sure the mount the board sits on is tightly attached to the fan housing and add bigger screws if loose or else it loses ground.

5) Most likely at that age the relay for the inducer is weak and fluttering. Try tap them gently with a screwdriver and if it drops out then it is most likely weak.
 
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