Hi all, so in the hunt for the cause of my high idle(2000-2500 RPM), I replaced the O2 sensor, as this was mentioned as a possible cause. I had a fairly easy go at the job, however, when I started the car upon completion, I got a strange burning smell(it also did not solve the idle issue). It was definitely not the usual smell to me; it was similar to burning plastic, as far as smells go. I do think I could notice a bit of gray fumes or whatnot that is not usual. Any thoughts on that? Is there a normal "burnoff" period or anything that I may not be aware of? As an aside, I have a hunch that the mixture is set rich. Thanks for any thoughts!