I bought a used car last Thursday from a local used car dealer in FL AFTER paying to have it checked by a mechanic and being told that it was 'safe' to buy. At the time of the sale, I asked to buy a Warranty...but the dealer said he had to check the pricing since it was 'new pricing' and that I could add it the next day when he called me. So, I made the purchase at $6599.94. WITHIN 24 hours, a yellow light came on for an Emissions problem. I took it back to the dealer...and he said...'You bought it...AS IS!' They sent me back to the mechanic who said it was NOT a crisis and to drive with it. Today, my car stopped in an intersection when accelerating. I have now taken the car to a Nissan dealer who says that the computer brain is destroyed and that the engine is about to fall out. Help!