hey guys, so i was driving home from work in my 91 civic cx and everything was fine for about 10 minutes until i downshifted and my car felt like it was rev limiting or something so i continued on and it drives normal up to 3200 rpm but wont rev passed that almost as if it cant pass that point. When i got home i popped the hood and every couple of seconds or so it makes kind of click or something at idle. I dont know whats going on and its my only way around. If someone could help troupleshoot it or let me know whats wrong that would be sweet. Thanks Nathan