Redshift Search Receiver (RSR) is a ultra-wideband spectrometer that covers the entire 3mm astronomical band (75-111 GHz) simultaneously. It has been developed at UMass/FCRAO as the facility instrument for the Large Millimeter Telescope (LMT), a 50m diameter telescope designed to at millimeter and submillimeter wavelength, currently under-construction jointly by UMass and INAOE on a 15,000 ft hight peak in Mexico. In this talk, I will present the results from the 12CO (J=1-0) line survey of 28 local ULIRGs (z=0.043-0.110) conducted as part of the commissioning and early science observations using the FCRAO 14m telescope early this year. We have detected CO emission in 22 ULIRGs, including twelve objects that were observed at this wavelength for the first time. I will discuss the connection between the molecular gas content and the infrared excess among the local ULIRGs. In addition, I will discuss the plan for the surveys of redshifted CO emission from intermediate and high-z galaxies as part of the first light science program using the LMT during the fall/winter 2008 observing season.