My van will start for about a minute and then shut off.

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My van will start for about a minute and then shut off. I replaced the starter, fuel pump, spark plugs,alternator, and battery. I feel that it could be the injectors because I put fuel cleaner in the gas tank and it ran for at least 2-3days and now it is giving me the same problems. it starts and then shuts off, as well as when I driving. What Do I need to do and what Do you think the problem is? Please Help..