Random Start

Van drives fine, park somewhere go back in and it starts for a second then shuts off. can't start anywhere from half hour to overnight. Happen last year and fuel pump was replaced. Day later did same thing. Ground screw was tighten. Been starting fine until 7/11/06 doing the same thing as before. Dealer thinks it may be in the theft deternt module but can't promise. Has anyone run across this random start issue.