I have a 90 Olds 88 just recently ive got this rattle noise and cant find where its coming from. It sounds like its around the belt area. Ive checked the belt and it looks good and tight, the pulleys are not loose. It sounds like a roller coaster going up a hill. When I give it gas the noise is hardly there but when im stopped at a light it sounds horrible. Check engine light is not on and im not having any problems Driving even though today it did kind of loose power once but hasnt since the noise started. Any clue where it might be coming from. And dont tell me to junk the car, this was a one owner car and was well take in care of. Thanks