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Do you have a standing pilot or electronic ignition? Bryant used both. Also give me model on gas valve
Bryant used both White Rodgers 36E valves or Honeywell VR800A or 8200H valves
Blower should be energized 75 seconds after burners ignite every time.I not we probably have a failing PCB (Printed circuit board). If you have a meter, allow burners to light and check between terminals COM and LO on PCB where fan wires connect.75 seconds after ignition we should get 120vac.
Just to make sure thermostat is not issue,Go to furnace and connect the R and W terminals on board and see if it will stay on.Also if thermostat uses batteries, replace them