2002 Honda civic ex wont rev past 4k, its like the car red lined whenever i try, if the car was sitting for a while and i start it up it revs fine but after driving for a min it starts again, seen others asked the question here but never saw the final answer so i joined here, hope someone here can help

 

You're in Limp mode. There's probably a Check Engine Light associated with it, that you need to get checked.