i have a 1993 chevy fule size blazer with the 350 its boging at a low rpm and when i let off the gas and does not have the power it should when i give it gas its like its being held back when in nutral if u hold the gas at 1 rpm it bogs has all new plugs and wires cap rotor coil the cat is not pluged and is not o2 sensors im prity sure its a sensor just not sure wich one