Car jolting when reaching certain revs
 

Hi! I brought a 2010 Mazda 3 from a car dealership. When I was taking it for a test drive it started jolting and the engine and traction control light come on. We took it back and they said they will fix it. About a month later they said they spend a few grand fixing it but it’s ready. The second day of me having it, it started again. It will start shaking / jolting when it gets to 2500 - 3000 revs and once it gets to 4000 revs it won’t go over that at all. Has anyone else expected this? And if so what was it?