I searched and i cant find my exact problem. I just completely rebuilt my motor (ka24e) and put it in tonight. Had a couple little normal stuff and one big one. My motor wont rev past 2500 rpm. It idles great and then at 2500 it starts bucking like crazy almost like the rev limiter but a little sloppier. I took it out to see what it did under different loads and it does the same thing. The only thing that I know of that is wrong is a valve on the ps side of the motor has a vacuum line going in the top and two out the bottom.The bottom is broke but if i hold it on it doesn't change anything. I really think it is electrical but I cant find anything wrong and it didn't do it before I rebuilt it. Sorry the thread is so long but please help me.