1996 Chevy Tahoe Miss on No# 6 and o2 sensor

The injection "spider" is the injectors that are mounted under the plastic upper intake plenum.Those engines had alot of problems with injectors going bad, which is what sounds like is wrong with yours.The o2 sensor... exactly what code did it have in the PCM for it? the sensor may be reacting to the misfire, always make the engine run right before going after o2 sensors.My software doesnt say how many o2 sensors you have, there is at least 1 before th ecat converter and 1 after thecat to measure efficiency.Look in the exhaust pipes just after the manifolds to see if there is an o2 for each side of the engine