When driving the car when you would let off the gas sometimes the engine would suddenly start a high pitched chirping noise. Was really loud and embarrassing as you came to a stop light, it would continue until you accelerate. I read that it has something to do with some lifters in the engine possibly. A work around was to open the oil cap on the engine for 2-3 minutes (I did it when I was getting gas mostly) and then close it and supposedly from the forum i read this let out the pressure and it wouldn't do it for awhile. It did work every time so I guess there was some truth to the work around. It was a temp fix within 3-4 days it would happen again, so I just always did this when i got gas and if it started to make the noise I would just pull over and do it, then it would be gone for a few days. Annoying but never caused damage.