im not expecting anyone to know, but my mom has a 97 taurus wagon and we just got the engin rebuilt last year. on the highway or anywehre 70k plus the enginge starts to like roar pretty loud. Weve taken it in and spent money on new pumps and everything and we dont know whats goin on with it. It runs fine its just loud and it doesnt even rumble anything. Anyone have any ideas?