one code says i have a cyl3 missfire and the other one is something with the injector driver circuit po1200. car has new wires,plugs, and i just replaced intake gaskets i was having these issues before i replaced intake gaskets and car has a slight miss at idle i dont know where to start.

Check the ignition coil...possible weak spark. Check this write up this is in tech info under electrical (Testing coils & spark plug wires) good luck

You may have a bad injector in cylinder 3

Could be a pcm also. let us know...

it was the no.3 injector changed it car runs smooth as glass