3 of my cars are Shutting Down Randomly?

I have 3 separate cars Mazda 6 2005, VW Jetta 2006, Honda Civic 2005 LX. All have the same problem they shut off randomly. I changed the fuel pump on both the Civic and the Mazda and it made them work for a little bit but then the problem occurred again. I replaced the spark plugs on the Mazda and it worked for about 1 drive about 2 miles long, then I tried running it again and it just kept shutting off. Need help as soon as possible. I really don't think its a fuel pump, or the spark plugs, I also tested the connections to the spark plugs to see if they were delivering spark and they all were.

If you buy fuel for all your cars at the same place it may be bad fuel or water in the fuel tank. Drain some fuel from the fuel line at the fuel pump into a clear container and see if it looks cloudy or separated.

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