When I search on Craigslist for a particular car, I always click "gallery", then the "titles only" button, and the "has image" button. The "titles only" button filters out all those keyword idiots, and the gallery shows the cars lined up on the page like they're on a car lot.
Then I hit "lowest to highest" on the dollar signs, and if I'm really serious and have a specific budget, I add "max price"
I also flag any ad featuring a late model or really nice looking car with a ridiculously low price (always ending in something other than a 0, 5, or 9 for whatever reason) and either an e-mail address such as "joeblow@gmail, or an out-of-state area code. Such as this ad, with a New Jersey area code:
http://miami.craigslist.org/mdc/cto/4709344621.html
Had to resist the urge to flag it!