I recently filled up my car with a tankfull of Mobil's "special" grade (89 octane) gasoline. Since I filled up, the Classic is running like ****, the idle is constantly stuck around 1500rpm and won't go down, and my throttle response sucks-which is even worse because I just installed a Place Racing CAI, and was becoming quite fond of the extra powerI figured my fuel filter got "nuked" by a bad tank of gas, so i went out got a new filter and installed it. I then drove it around for a few minutes like I normally would, and stopped. The same thing-crappy idle, poor throttle response. Do you guys think a)It's the fact that I had been running 92 octane in it for awhile before I was "stuck" and filled up with Special(they were out of Premium and I was in the middle of nowhere)Or b) My AIV valve is screwed up because I had to throw a breather on it when I installed the CAI. Someone on SE-R.net had suggested in one of their articles that when the AIV goes bad, the idle suffers. It's pretty much been making the same noise it always has, and the car was running great until I put this gas in my tank. I've since gone out and got some 93 octane +octane boost to try and "flush' out the system. Any other suggestions???