I have a 91 accord lx sedan. I have a really strange idle problem. When I start the car or have it in park, the idle constantly goes up to 3000 rpms when car is cold and 2000 rpms when car is already warmed up. It wont stay that high. It goes up and down up and down up and down as if I were pushing the gas and letting go. Someone told me that it could be the throttle body but i never changed it. Is there anything else that it might be? Also when I am stop at a light the car putters and the idle is at or a little over 1000 rpms. I need help bad. Please help.