Okay so heres the deal, i had recently put on a thermal r+d exhaust set up with no catalytic converter and a header with both 02 ports. So i have both sensorss hooked up. BUT my problem is i have a rolling idle. When i start the car it goes up to about 3500 then down and up and down and as it warms up it goes down but it continues to go up and down just at lower levels. It used to go away after a few miles but now its driving me frickin nuts. I think it may be the cat but im not sure. I recently replaced wires, plugs, distributor, and checked all the vacuum lines and iac valve etc. Im really wanting to fix this and get it over with so......COUld this be because im running without a cat or what? Or can it be a fuel pump or something. PLEASE HELP ME>>>>>>its non-v-tec 96 lx

 

check the throttle position sensor