Do you have an automatic? I dip into the 200RPM range some times on my manual when I take off with too little gas. It's actually kind of fun, lol. Rough idle has gotten me that low as well before, but I just rev it back to life. It hasn't done that in a long time for me, I considered doing all the cleaning of the various parts to fix it after reading all the threads. I just raced the car around a bit and it doesn't do that to me any more. I vary the car between driving like a grandma, normal, and aggressively.