I have a 2001 SS Monte Carlo trouble code said cylinder 3 miss fire. I have replaced spark plugs, wires, and coil packs, and i still this miss fire. Can someone point me in the right direction.

 

Injector could be bad on that cylinder. You can switch the injector to a different cylinder, and see if the misfire follows.

 

Agreed, that would be the next logical step.

To be on the safe side, before ripping into that, re-check that spark plug. I know a guy who had the same problem on the 3800 in his wife's Impala and went crazy trying to find the problem. Turns out the nice new plugs he put in had a bad one (the ceramic piece spun completely around). He also used Bosch plugs which I will never use on GM cars (he switched to AutoLites after that experience).
Takes but a moment to double check that plug in that cylinder, I'd do that and double check the wire. If all looks good, swapping an injector around makes sense.