The inducer fan blade is broke furance is a bryant plus 90 cannot get part on a Sunday.can I reinstall motor without blade and run furance

No. The impeller is required to create an induced-draft and engage the pressure switch. P.S. DO NOT get adventurous & jumper the pressure switch. In the absence of an induced-draft, the burner flames will not be drawn through the heat exchanger. The likelihood of damage to the unit, as well as personal injury & property damage, is... virtually guaranteed.