I know everyone and their dog has a post about idle problems, and ive probably read 95% of them. My car is bouncing up and down during idle, only when its warm. I cleaned my idle air controller, put on a differnt one (used one that was also cleaned, makes no differnce. I cleaned the FITV and this made no differnce (cleaned it so nice it looked like new Took it to the radiator shop and had the coolant system flushed (nasty stuff came out) and he bled it very very good, but still didnt fix it. I can unplug the iacv and pull the throttle enough to keep it going, but it still jumps. Checked for vacuum leaks, replaced all the vacuum lines, put hand over throttle body to choke it off, and it died (multiple people say this means no vacuum leaks) PCV valve is not cracked and seems to work great. Brand new distributer cap, spark plug wires, and iridium plugs. AND im not throwing a check engine code. Now it does idle really low, and as a temperary fix i just tightened the throttle, could the idle screw be turned so low and be causing this? Also when the throttle is not pulled tight and i put the clutch on, the idle drops way down (lowest mark on rpm gauge) and then goes up a bit and continues to jump. Im wondering what to check next, fuel system? Map sensor? TPS? valve lash? timing? Im to the point that whoever can tell me what to check next and it solves the problem i'll send 10 dollars through paypal.