About two weeks ago our van died while my wife was driving it. It started back up ok and we did not have any other problems until two days ago when after putting some gas in the tank, it would not start at first but then did start. Today, I noticed it did not start at first but once again it did start. After driving it for a while I went into a dentist for an appointment and when I returned it started but then on my way out of the parking lot it died and not will not start at all. It does turn over and at times acts like it wants to fire but doesn't start. Any ideas?