Running issues with 2001 gtp S/C

[Drewsuper88]

I was throwing a misfire in cylnider 1 and MIL {malfunction Indicator Lamp} code. I changed plugs and cleaned MAF and Clean Throttle body and still the same. How would i go about uncloggin the CAT?

[Drewsuper88]

also the CEL isnt on but i believe thats due to the MIL and dont really know how to go about fixing that ethier. While there is no light i am still pullin those two codes.