I have a xv90 trane gas furnace. The inducer motor runs, but does not pull enough vacuum to close the pressure switches. I've already disconnected the vent, checked the condensate drain and vacuum hoses. The vacuum line does not connect directly to the inducer motor. Any help would be appreciated.

Is the vacuum hose in good shape? Free of dryrot ,cracks,or holes

Thanks for the response, but I solved it. Plastic bag in the intake pipe.