i got up this morn, car turns over but wont start. it runs ex, havent had one problem at all before i parked it night before. only 106k, no issues, only drive it a hundred or two miles a week. now, the gas cap wasnt on all the way. i know i tighten it everytime i put gas in my car. i feel like someone couldve put something in my tank. but could you put something in a gas tank to make a car not start right away? wouldnt it at least start for a min or so?? but if im just paranoid, what else could make a perfectly fine running car not start the next morning? i was very near empty and ive since put a gallon in it but that didnt work. checked fuses, seem fine. i dont get it. where do i start? what do i do first thru last? thanks for any expertise guys, and girls. thanx, thanx, thanks. (btw, its fuel injection, 2.5 ltr, v6)