Just bought the car and took to the Hyundai dealer. Had a squeal in the engine. Replaced all belts and timing belt and 2 tentioner pullys on timing belt. Runs a lot quieter but I get a small squeal after it warms up at 1500 rpm to 2300 rpm. When going down the highway the pitch never changes but I can hear it after a few miles, 100% of the time. The fellow that did the work said to give it a couple hundred miles for the belts to streach a bit and it would stop. It's been 200 miles and still hear it. Any ideas?