kimatc

I just purchased this vehicle for my son saturday. We didn't have any issues during the test drive and I was pretty excited about the vehicle (a few minor things like rear passenger window doesn't work nor does sunroof) but then my son was coming home from school today and he said it stalled on him. He started it again and continued to drive home and it stalled again. Now I'm very concerned it wasn't a good buy. Any suggestions on what may cause this?