1. Nothing. They simply harvested your e-mail address and sold it to a SPAM outfit.
2. You get a poorly worded response, asking if the "vehicle is still available?" (they already asked that) or asking you to send pictures etc.
3. If you respond to the e-mail in #2, they then make a pitch to send you a cashier's check - and provide a long-winded story about wanting to buy "the vehicle" and another long-winded story as to why the cashier's check is for more than the amount you are asking and then asking you to wire money via Western Union to a 3rd party.
See also: Anatomy of a Craigslist Scam