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I am so tired of dealing with my car's idle problem. If I can get it fixed once and for all, I'll be the happiest man alive. Now my car has developed a new idle issue. I still have my other idle issue, where I have to rev it to keep it from stalling. However, this issue has started appearing more and more often over the past few weeks. Basically what happens is the idle goes up, cuts out, goes up, cuts out, goes up, cuts out, etc. Much like "cyclic idles" that you see on tuned cars. It does then when it's supposed to be idling (obviously). If it's idling and the car is moving (like if I'm coasting in neutral to a stop sign), it'll do this cyclic idle. However, once I come to a stop, the idle will return to normal. Very recently, it is now doing it all the time though. Here's a video of what's happening: https://www.youtube.com/watch?v=6xBu3RJIZrk&feature=youtu.be It's like it's trying to rev up to a kinda high idle, but then it get cut off. I don't really know how to explain it. The only CEL code I have is for "air control valve or circuit". I have replaced and cleaned the IACV twice now using junkyard units. Whatever I've done has made absolutely no difference. I've thought about replacing the wiring harness that goes to the IACV, but my testing says I might not need to. I've got power going to the IACV plug and resistances are within tolerances. The only thing I haven't tested is the ECU. Again, my previous idle issue is still there. It kinda feels like if there's water in the intake or something, since I've driven into deep mud before. However, I have sprayed every little and big vacuum hose in the engine bay with carb cleaner and haven't noticed any leaks. Sprayed the intake manifold gaskets, TBI, intake, PCV, and I didn't notice anything. My car has an exhaust leak and a misfire when idling, although it drives fine. Also, I have replaced my CTS twice. Currently have a brand new one in there, and it reads correct resistance at all temperatures. 1990 Subaru Loyale, EA82 N/A So, I'd like some help with this. I'm hoping that this new issue could be a possible fix for my other idle issue. My other idle issue seems to be OAT related: when it's warm outside, it'll idle fine. When it's cold outside, it won't want to idle and I have to rev it to keep it from dying. Has nothing to do with engine temperature; just outside air temperature. Any ideas? I can't stand this idle issue. My main issue is just plain dangerous, and this cyclic idle is annoying (and embarrassing, really).