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Does anyone know what the general signs & symptoms of a bad MAP sensor and a bad O2 sensor? how would i be able to tell which one is bad ( refer to my prior post "95 Laredo 4.0")

i am recently having troubles with my 95 gcl it drives down the road surging spitting and acting like its got water in the gas or not getting gas i have recently replaced the CPS from a prior problem and check engine light my codes say the o2 sensor. the fuel pump is fine ect so i know its...