2006 Buick. makes a loud thud noise. Intermittent. Tow 1000 lbs and after about 300 miles drops mpg from 19 to 12 and feels like not getting out of low gear. No lights on, nothing shows in dealer machine. Anyone got a suggestion? thanks
2006 Buick. makes a loud thud noise. Intermittent. Tow 1000 lbs and after about 300 miles drops mpg from 19 to 12 and feels like not getting out of low gear. No lights on, nothing shows in dealer machine. Anyone got a suggestion? thanks