2002 Saab 93. Yesterday I drove 40 miles, parked car for 4 hours. Then got gas (had 1/3 tank). Drove 40 miles home. Car was completely normal. 20 minutes later, went to start car again. It turned over, but "chugged" a little, and shut off. Tried again and gave it a little gas... Still shut off. Now it doesn't turn over. Local novice mechanic kid shot some carb cleaner into some pipe, and this allows it to turn over, but still shuts off. Any clue?