What are my rights if a car dealership sold me a "as is" car under deception

To make a long story short I bought a car from a car dealership, after a "so-called"private seller posted it on craigslist that the car was in "great working condition" (I took a picture of the ad) I test drove it nothing sound wrong and I ASKED what is wrong with the car he assured me nothing. Then he stated to go to the dealership with him to sign the paper . I signed the papers (bill of rights paper that I signed did not say salvaged) but before handing him the money I asked again whats wrong and again he said nothing. So I handed him the money and left. No more than a hour later the car shut off. I needed a purge valve $200 ,timing chain $3000 and looking at my papers my signiture is on a paper that says title rebuilt/no airbags. I WOULD HAVE NEVER SIGNED THAT...and he is not willing to fix the issue after false advertising a great working car.