Hey there, I have an erratic idle when the car is at any temperature, Sometimes the rpms will rev up to 1200-1400 and hang there for a few seconds, and when it doesnt do that it will bounce from under 600 all the way up to 1400 sometimes going up to 2000. I have had the temp sensor(blue thing) replaced and it seems to have made the problem a little worse. I have no idea what it could be and the mechanic i am taking my car to isnt being very helpful. Would love any suggestions. My battery also died recently when i left my lights on when i went into work, could this have been a part of this. Thanks