Hello I purchased a 1990 Nissan 240sx from a private seller. As I was driving home on the purchase date the vehicle broke down on the freeway and I had to be towed. I had a mechanic take a look at it and said that the engine was blown and that it was a bad engine from the start. I called them back that same night and the following day. The craigslist posting said that the engine had just been rebuilt. I called the previous owners back and they said that they would not return my money back. The posting shows a different shift knob than the one that the car came with so if they are willing to change that then maybe they messed with the engine parts in order to get as much back from the car as possible. I have the pink slip signed by the previous owner but not from me and proof of all papers. The only thing he has is the attached piece that came with the pink slip and we did not do a bill of sale. Can I sue for my money back?