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The HT lead should be replaced as by pulling it off the plug the internal resistance has been damaged. Check the injectors are firing correctly as my guess is that the injector is faulty and that is what set you to change the HO2S sensor
It could be normal. The coils fire a negative and a positive charge at the same time. So cylinder one gets a positive and the opposite cylinder gets a negative at the same time. A positive jumps from the electrode to the base and a negative jumps the opposite direction. Both still fire the fuel in the cylinder. The miss is probably not bad enough to set a code, yet. The loss of power from a cylinder has to be more than 50% to set a code. The computer "sees" a drop in RPM to set a code.
sounds like spark plug coil is bad. had the same problem on my truck also. check wich cylinder is misfiring and replace the coil and maybe the plug also. if the plug looks good leave it. autozone can give you a read out. when checking the coil, if it has a rust color to it its bad and needs to be replaced. 02 z28
check high voltage wires for cracks,chafing or melting, also replace the plug. try turning the engine over with a known good plug connected but not installed in the cylinder to confirm no spark. if there is spark but you still have a missfire, then you have a dead cylinder. if no spark, its the coil or coil module. replace plugs and wires 1st. its cheap compaired to sensors and modules