cylinder 2 misfire, other issues

[liftednali]

Hey guys I got a 2000 (OBS) denali. Ever since I got the truck I've had the check engine light come on for the bank 2 o2 sensor. A couple months ago I went ahead and replaced both o2 sensors and the code went away. Recently its been popping up with a cylinder 2 misfire cocode I checked and replaced my plugs, wires and distributor cap. It still comes on from time to time. The last code I just got today was for my catalytic converter showing low threshold on bank 2. Has anyone experienced this problem before or how should I go about fixing it? I was told at autozone to start with my fuel injectors they said it could be tied with the catalytic converter itself or a sensor of it or a sensor that reads the fuel air ratio.

Thanks

 

[SunlitComet]

You can have a shop perform a injector balance test to see how the injector are fairing. chances are the misfiring has messed up your cat if it is mounted on the right bank.