95Cherry

Hey, I have a 95 Jeep Cherokee and I did a tune up, new plugs, wires, distbutor, o2 sensor and injectors. The problem is, it is running on 5 cylinders and when I unplug the #2 cylinder injector, there is no difference.... it has not thrown a code yet, I have spark and sometimes the #2 cylinder will fire, like you can hear a difference in the tone, but it goes back to 5 cylinders.... Can anyone help me? Thanks