No change in the idle when I spray carb cleaner around the injectors. While I was at the front of the car while it was running I heard a nasty sound that sounded like a bad bearing in a fan. It started then after a while stopped. I narrowed it down to what I think was the air pump (under the alternator). Could there be a problem with the air pump or O2 sensor that could be causing this rough idle (too rich) condition?