Looking for help. I finally got my blazer to the point where I can insure it......or so I thought I tool it for one last test drive and it keeps swanting to stall and rims bounce between 1500 and 2500 rpm as soon as I get to 3rd gear. It does this weather I manualy put it in 3rd or get to a high enugh speed that it shifts into 3rd. Any one able to help me figure this out?