00gtbk

Im having a miss around 1500-2000 while driving normal and if i get it on its missing in the upper rpms. it does not do it untill the car has been runing for a while. and then sometimes it doesnt even do it then. i think its one of my COPS. but im not sure how to even check them. also it sometimes has a miss while idleing, i have a 2000 gt stick. thanks for any help.