I have a high mileage 1996 Buick Lesabre Custom. It started to shimmy very badly. I had the belt tensioner replaced. That solved the shimmy, but it started to squeal. Now the the squeal is VERY LOUD. I have replaced the alternator. What else could possibly be making this noise? The engine doesn't get hot, and the power steering is fine. There is a slight drag when I hit the gas to take off at a red light but evens out after 2nd gear. PLEASE help me! I already spent sooo much and haven't got an answer yet!